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/setup-win32.h

@@ -71,7 +71,6 @@
  * just as under Linux (e.g. <sys/socket.h>) and the Winsock headers should
  * never be included when __CYGWIN__ is defined.
  */
-
 #ifdef _WIN32
 #  if defined(UNICODE) && !defined(_UNICODE)
 #    error "UNICODE is defined but _UNICODE is not defined"
@@ -89,7 +88,6 @@
  * those symbols to compare against, and even those that do may be missing
  * newer symbols.
  */
-
 #ifndef _WIN32_WINNT_VISTA
 #define _WIN32_WINNT_VISTA          0x0600   /* Windows Vista */
 #endif