tidy-up: miscellaneous

- `N byte` -> `N-byte` or `N bytes`.
- INTERNALS.md: language tweaks.
- schannel: language tweak in comment/error message.
- socks_gssapi, socks_sspi: simplify composing an error message.
  (at a cost of 8 extra constant string bytes.)
- m4/curl-compilers.m4: fix typo in link (in comment).
- contrithanks.sh: fix indent, drop stray `;` terminator.
- lib, src, tests: drop/fix a bunch of badwords.
- fix typos in comments.
- fix indent, stray spaces.

Some of these spotted by GitHub Code Quality and Copilot

Closes #22009

docs/INTERNALS.md

@@ -24,7 +24,7 @@ want it to remain functional and buildable with these and later versions
 
 ## Dependencies
 
-We aim to support these or later versions.
+We aim to support these or later versions:
 
 - brotli       1.0.0 (2017-09-21)
 - c-ares       1.16.0 (2020-03-13)
@@ -49,9 +49,9 @@ We aim to support these or later versions.
 
 When writing code (mostly for generating stuff included in release tarballs)
 we use a few "build tools" and we make sure that we remain functional with
-these versions:
+these or later versions:
 
-- clang-tidy     17.0.0 (2023-09-19), recommended: 19.1.0 or later (2024-09-17)
+- clang-tidy     17.0.0 (2023-09-19), recommended: 19.1.0 (2024-09-17)
 - cmake          3.18 (2020-07-15)
 - GNU autoconf   2.59 (2003-11-06)
 - GNU automake   1.7 (2002-09-25)

docs/examples/httpput-postfields.c

@@ -40,7 +40,7 @@ static const char olivertwist[] =
   "all events; the item of mortality whose name is prefixed";
 
 /* ... to the head of this chapter. String cut off to stick within the C90
-   509 byte limit. */
+   509-byte limit. */
 
 /*
  * This example shows an HTTP PUT operation that sends a fixed buffer with

docs/libcurl/opts/CURLOPT_INTERLEAVEFUNCTION.md

@@ -38,7 +38,7 @@ interleaved RTP data. This function gets called for each $ block and therefore
 contains exactly one upper-layer protocol unit (e.g. one RTP packet). curl
 writes the interleaved header as well as the included data for each call. The
 first byte is always an ASCII dollar sign. The dollar sign is followed by a
-one byte channel identifier and then a 2 byte integer length in network byte
+one-byte channel identifier and then a 2-byte integer length in network byte
 order. See RFC 2326 Section 10.12 for more information on how RTP interleaving
 behaves. If unset or set to NULL, curl uses the default write function.