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/ftp-wildcard.c

@@ -133,7 +133,9 @@ int main(int argc, char **argv)
   curl_easy_setopt(curl, CURLOPT_CHUNK_DATA, &data);
   curl_easy_setopt(curl, CURLOPT_WRITEDATA, &data);
 
-  /* curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); */
+#if 0
+  curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+#endif
 
   /* set a URL containing wildcard pattern (only in the last part) */
   if(argc == 2)