tidy-up: miscellaneous

- H3 proxy: re-sync code with original source `curl_ngtcp2.c` to reduce
  differences, and to apply missed minor fixes. Also apply clang-format.
  Drop redundant `#undef`s, casts, `#endif` comments, includes, drop
  intermediate variables, sync include and macro order.
  Follow-up to e78b1b3ecc #21153
- INSTALL-CMAKE.md: move `CURL_ENABLE_SMB` to the enable section.
- tests/http/env: rename `tcpdmp` to `tcpdump` to match object variable.
- mbedtls: drop incorrect `mbedTLS 4+` comments.
  (features are also supported by 3+, meaning it's always supported.)
- lib1648: rename a variable to match purpose.
- CIPHERS.md: alpha-sort link list.
- replace rare `X''` hex markup with `0x`.
- `IP v4/6` -> `IPv4/6`.
- 'version X.Y' -> 'vX.Y', where sensible.
- 'VX.Y' -> 'vX.Y', where sensible.
- fix indents, casing, newlines, typos.

Closes #21772

docs/CIPHERS.md

@@ -270,10 +270,10 @@ Restrict to only TLS 1.2 with the `CAMELLIA-128-GCM` cipher.
 
 ## Further reading
 
-- [OpenSSL cipher suite names documentation](https://docs.openssl.org/master/man1/openssl-ciphers/#cipher-suite-names)
-- [wolfSSL cipher support documentation](https://www.wolfssl.com/documentation/manuals/wolfssl/chapter04.html#cipher-support)
-- [mbedTLS cipher suites reference](https://mbed-tls.readthedocs.io/projects/api/en/development/api/file/ssl__ciphersuites_8h/)
-- [Schannel cipher suites documentation](https://learn.microsoft.com/windows/win32/secauthn/cipher-suites-in-schannel)
-- [IANA cipher suites list](https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4)
-- [Wikipedia cipher suite article](https://en.wikipedia.org/wiki/Cipher_suite)
 - [GnuTLS Priority Strings](https://gnutls.org/manual/html_node/Priority-Strings.html)
+- [IANA cipher suites list](https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4)
+- [mbedTLS cipher suites reference](https://mbed-tls.readthedocs.io/projects/api/en/development/api/file/ssl__ciphersuites_8h/)
+- [OpenSSL cipher suite names documentation](https://docs.openssl.org/master/man1/openssl-ciphers/#cipher-suite-names)
+- [Schannel cipher suites documentation](https://learn.microsoft.com/windows/win32/secauthn/cipher-suites-in-schannel)
+- [Wikipedia cipher suite article](https://en.wikipedia.org/wiki/Cipher_suite)
+- [wolfSSL cipher support documentation](https://www.wolfssl.com/documentation/manuals/wolfssl/chapter04.html#cipher-support)

docs/CONTRIBUTE.md

@@ -261,7 +261,7 @@ work.
   has already been closed.
 
 - `Ref: URL` to more information about the commit; use `Bug:` instead for a
-  reference to a bug on another bug tracker]
+  reference to a bug on another bug tracker.
 
 - `Fixes #1234` - if this fixes a GitHub issue; GitHub closes the issue once
   this commit is merged.

docs/INSTALL-CMAKE.md

@@ -242,6 +242,7 @@ target_link_libraries(my_target PRIVATE CURL::libcurl)
 ## Enabling features
 
 - `CURL_ENABLE_NTLM`:                       Enable NTLM support. Default: `OFF`
+- `CURL_ENABLE_SMB`:                        Enable SMB. Default: `OFF`
 - `CURL_ENABLE_SSL`:                        Enable SSL support. Default: `ON`
 - `CURL_WINDOWS_SSPI`:                      Enable SSPI on Windows. Default: =`CURL_USE_SCHANNEL`
 - `ENABLE_IPV6`:                            Enable IPv6 support. Default: `ON` if target supports IPv6.
@@ -296,7 +297,6 @@ target_link_libraries(my_target PRIVATE CURL::libcurl)
 - `CURL_DISABLE_RTSP`:                      Disable RTSP. Default: `OFF`
 - `CURL_DISABLE_SHA512_256`:                Disable SHA-512/256 hash algorithm. Default: `OFF`
 - `CURL_DISABLE_SHUFFLE_DNS`:               Disable shuffle DNS feature. Default: `OFF`
-- `CURL_ENABLE_SMB`:                        Enable SMB. Default: `OFF`
 - `CURL_DISABLE_SMTP`:                      Disable SMTP. Default: `OFF`
 - `CURL_DISABLE_SOCKETPAIR`:                Disable use of socketpair for curl_multi_poll(). Default: `OFF`
 - `CURL_DISABLE_SRP`:                       Disable TLS-SRP support. Default: `OFF`
@@ -486,7 +486,7 @@ Examples:
 - `HTTPD`:                                  Absolute path. Default: search for `apache2`
 - `DANTED`:                                 Absolute path. Default: search for `danted`
 - `TEST_NGHTTPX`:                           Absolute path. Default: search for `nghttpx`
-- `VSFTPD`:                                 Absolute path. Default: search for `vsftps`
+- `VSFTPD`:                                 Absolute path. Default: search for `vsftpd`
 - `SSHD`:                                   Absolute path. Default: search for `sshd`
 - `SFTPD`:                                  Absolute path. Default: search for `sftp-server`
 

docs/RUSTLS.md

@@ -56,7 +56,7 @@ Once downloaded, build `curl` using `--with-rustls` and the path to the extracte
 Building `rustls-ffi` from source requires both a rust compiler, and the [cargo-c] cargo plugin.
 
 To install a Rust compiler, use [rustup] or your package manager to install
-the **1.73+** or newer toolchain.
+the **1.73** or newer toolchain.
 
 To install `cargo-c`, use your [package manager][cargo-c pkg], download
 [a pre-built archive][cargo-c prebuilt], or build it from source with `cargo install cargo-c`.

docs/internals/CHECKSRC.md

@@ -40,21 +40,21 @@ warnings are:
   code style mandates the assignment to be done outside of it.
 
 - `ASTERISKNOSPACE`: A pointer was declared like `char* name` instead of the
-   more appropriate `char *name` style. The asterisk should sit next to the
-   name.
+  more appropriate `char *name` style. The asterisk should sit next to the
+  name.
 
 - `ASTERISKSPACE`: A pointer was declared like `char * name` instead of the
-   more appropriate `char *name` style. The asterisk should sit right next to
-   the name without a space in between.
+  more appropriate `char *name` style. The asterisk should sit right next to
+  the name without a space in between.
 
 - `BADCOMMAND`: There is a bad `checksrc` instruction in the code. See the
-   **Ignore certain warnings** section below for details.
+  **Ignore certain warnings** section below for details.
 
 - `BANNEDFUNC`: A banned function was used. The functions sprintf, vsprintf,
-   strcat, strncat, gets are **never** allowed in curl source code.
+  strcat, strncat, gets are **never** allowed in curl source code.
 
 - `BRACEELSE`: '} else' on the same line. The else is supposed to be on the
-   following line.
+  following line.
 
 - `BRACEPOS`: wrong position for an open brace (`{`).
 
@@ -80,8 +80,8 @@ warnings are:
   string, use it
 
 - `INDENTATION`: detected a wrong start column for code. Note that this
-   warning only checks some specific places and can certainly miss many bad
-   indentations.
+  warning only checks some specific places and can certainly miss many bad
+  indentations.
 
 - `LONGLINE`: A line is longer than 79 columns.
 
@@ -99,7 +99,7 @@ warnings are:
 - `PARENBRACE`: `){` was used without sufficient space in between.
 
 - `RETURNNOSPACE`: `return` was used without space between the keyword and the
-   following value.
+  following value.
 
 - `SEMINOSPACE`: There was no space (or newline) following a semicolon.
 
@@ -107,7 +107,7 @@ warnings are:
   `sizeof(int)` style.
 
 - `SNPRINTF` - Found use of `snprintf()`. Since we use an internal replacement
-   with a different return code etc, we prefer `curl_msnprintf()`.
+  with a different return code etc, we prefer `curl_msnprintf()`.
 
 - `SPACEAFTERPAREN`: there was a space after open parenthesis, `( text`.
 
@@ -116,7 +116,7 @@ warnings are:
 - `SPACEBEFORECOMMA`: there was a space before a comma, `one , two`.
 
 - `SPACEBEFOREPAREN`: there was a space before an open parenthesis, `if (`,
-   where one was not expected
+  where one was not expected
 
 - `SPACESEMICOLON`: there was a space before semicolon, ` ;`.
 
@@ -127,7 +127,7 @@ warnings are:
 - `TYPEDEFSTRUCT`: we frown upon (most) typedefed structs
 
 - `UNUSEDIGNORE`: a `checksrc` inlined warning ignore was asked for but not
-   used, that is an ignore that should be removed or changed to get used.
+  used, that is an ignore that should be removed or changed to get used.
 
 - `USESAFEFREE`: there was a `curlx_free(var)` call made right before assigning
   NULL to `var`. We prefer replacing that with `curlx_safefree()`, which is
@@ -144,7 +144,7 @@ so: `enable <EXTENDEDWARNING>`
 Currently these are the extended warnings which can be enabled:
 
 - `COPYRIGHTYEAR`: the current changeset has not updated the copyright year in
-   the source file
+  the source file
 
 - `STRERROR`: use of banned function strerror()