doc: update websocket flag description to reflect stable API status

Author: debbs061

doc/api/cli.md

@@ -1611,7 +1611,7 @@ changes:
     description: Syntax detection is enabled by default.
 -->
 
-Disable using [syntax detection][] to determine module type.
+Disable exposition of [`WebSocket`][] on the global scope.
 
 ### `--no-experimental-global-navigator`