tidy-up: miscellaneous

- INSTALL-CMAKE.md: add missing periods, text fixes.
- md4, md5: sync variables names.
- curl_trc: sync an argument type.
- docs/examples: sync debug/trace function copies, constify, tidy-ups.
- replace commented code with `#if 0`.
- drop redundant parenthesis (macro values, `return`, around single
  variables, function calls).
- fix indentation, apply clang-format in places.

Closes #20481

docs/examples/sftpuploadresume.c

@@ -72,7 +72,7 @@ static curl_off_t sftpGetRemoteFileSize(const char *i_remoteFile)
     result = curl_easy_perform(curl);
     if(CURLE_OK == result) {
       result = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD_T,
-                              &remoteFileSizeByte);
+                                 &remoteFileSizeByte);
       if(result)
         return -1;
       printf("filesize: %" CURL_FORMAT_CURL_OFF_T "\n", remoteFileSizeByte);