module: partial doc removal of --experimental-modules

This removes `--experimental-modules` from showing up in `node -h`
and also removes the documentation from the man pages.

It will still work as a no-op, and is still included in cli.md

Refs: nodejs/modules#502

PR-URL: #32915
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Geoffrey Booth <webmaster@geoffreybooth.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/node.1

@@ -132,9 +132,6 @@ Specify the
 .Ar module
 to use as a custom module loader.
 .
-.It Fl -experimental-modules
-Enable experimental latest experimental modules features.
-.
 .It Fl -experimental-policy
 Use the specified file as a security policy.
 .

src/node_options.cc

@@ -285,7 +285,7 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             kAllowedInEnvironment);
   AddAlias("--loader", "--experimental-loader");
   AddOption("--experimental-modules",
-            "experimental modules features",
+            "",
             &EnvironmentOptions::experimental_modules,
             kAllowedInEnvironment);
   AddOption("--experimental-wasm-modules",