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/ghiper.c

@@ -158,8 +158,8 @@ static gboolean timer_cb(gpointer data)
   struct GlobalInfo *g = (struct GlobalInfo *)data;
   CURLMcode mresult;
 
-  mresult = curl_multi_socket_action(g->multi,
-                                CURL_SOCKET_TIMEOUT, 0, &g->still_running);
+  mresult = curl_multi_socket_action(g->multi, CURL_SOCKET_TIMEOUT, 0,
+                                     &g->still_running);
   mcode_or_die("timer_cb: curl_multi_socket_action", mresult);
   check_multi_info(g);
   return FALSE;
@@ -360,7 +360,7 @@ static gboolean fifo_cb(GIOChannel *ch, GIOCondition condition, gpointer data)
     }
     else {
       buf = g_malloc(BUF_SIZE + 1);
-      while(TRUE) {
+      for(;;) {
         buf[BUF_SIZE] = '\0';
         g_io_channel_read_chars(ch, buf, BUF_SIZE, &len, &err);
         if(len) {