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

lib/pop3.c

@@ -495,7 +495,7 @@ static CURLcode pop3_perform_upgrade_tls(struct Curl_easy *data,
   DEBUGASSERT(!pop3c->ssldone);
   result = Curl_conn_connect(data, FIRSTSOCKET, FALSE, &ssldone);
   DEBUGF(infof(data, "pop3_perform_upgrade_tls, connect -> %d, %d",
-         result, ssldone));
+               result, ssldone));
   if(!result && ssldone) {
     pop3c->ssldone = ssldone;
     /* perform CAPA now, changes pop3c->state out of POP3_UPGRADETLS */