doc: update websocket flag description to reflect stable API status

doc: update websocket flag description to reflect stable API status

doc: revert syntax detection description
PR-URL: #54482
Reviewed-By: Matthew Aitken <maitken033380023@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/cli.md

@@ -1653,7 +1653,7 @@ Use this flag to disable top-level await in REPL.
 added: v22.0.0
 -->
 
-Use this flag to disable experimental [`WebSocket`][] support.
+Disable exposition of [`WebSocket`][] on the global scope.
 
 ### `--no-extra-info-on-fatal-exception`