tidy-up: misc spelling (bit, ASCII)

Closes #14559

docs/TODO

@@ -347,7 +347,7 @@
 
 1.17 Add support for IRIs
 
- IRIs (RFC 3987) allow localized, non-ascii, names in the URL. To properly
+ IRIs (RFC 3987) allow localized, non-ASCII, names in the URL. To properly
  support this, curl/libcurl would need to translate/encode the given input
  from the input string encoding into percent encoded output "over the wire".
 
@@ -1234,7 +1234,7 @@
 
  -J/--remote-header-name does not decode %-encoded filenames. RFC 6266 details
  how it should be done. The can of worm is basically that we have no charset
- handling in curl and ascii >=128 is a challenge for us. Not to mention that
+ handling in curl and ASCII >=128 is a challenge for us. Not to mention that
  decoding also means that we need to check for nastiness that is attempted,
  like "../" sequences and the like. Probably everything to the left of any
  embedded slashes should be cut off.

docs/URL-SYNTAX.md

@@ -226,7 +226,7 @@ directory listing for the root / home directory is returned.
 FTP servers typically put the user in its "home directory" after login, which
 then differs between users. To explicitly specify the root directory of an FTP
 server, start the path with double slash `//` or `/%2f` (2F is the hexadecimal
-value of the ascii code for the slash).
+value of the ASCII code for the slash).
 
 ## FILE
 

docs/examples/debug.c

@@ -128,7 +128,7 @@ int main(void)
   CURLcode res;
   struct data config;
 
-  config.trace_ascii = 1; /* enable ascii tracing */
+  config.trace_ascii = 1; /* enable ASCII tracing */
 
   curl = curl_easy_init();
   if(curl) {

docs/libcurl/curl_version_info.md

@@ -116,13 +116,13 @@ new the libcurl you are using is. You are however guaranteed to get a struct
 that you have a matching struct for in the header, as you tell libcurl your
 "age" with the input argument.
 
-*version* is just an ascii string for the libcurl version.
+*version* is just an ASCII string for the libcurl version.
 
 *version_num* is a 24 bit number created like this: \<8 bits major number\> |
 \<8 bits minor number\> | \<8 bits patch number\>. Version 7.9.8 is therefore
 returned as 0x070908.
 
-*host* is an ascii string showing what host information that this libcurl
+*host* is an ASCII string showing what host information that this libcurl
 was built for. As discovered by a configure script or set by the build
 environment.
 

docs/libcurl/libcurl-tutorial.md

@@ -1255,7 +1255,7 @@ curl_mime_subparts(3). Once it has been
 bound to its parent multi-part, a nth-level multi-part belongs to it and
 should not be freed explicitly.
 
-Email messages data is not supposed to be non-ascii and line length is
+Email messages data is not supposed to be non-ASCII and line length is
 limited: fortunately, some transfer encodings are defined by the standards to
 support the transmission of such incompatible data. Function
 curl_mime_encoder(3) tells a part that its source data must be encoded