doc: remove --experimental-modules documentation

PR-URL: #38974
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Jan Krems <[email protected]>
Reviewed-By: Myles Borins <[email protected]>
Reviewed-By: Geoffrey Booth <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: iam-frankqiu

doc/api/cli.md

@@ -295,14 +295,6 @@ added: v9.0.0
 Specify the `module` of a custom experimental [ECMAScript Module loader][].
 `module` may be either a path to a file, or an ECMAScript Module name.
 
-### `--experimental-modules`
-
-<!-- YAML
-added: v8.5.0
--->
-
-Enable latest experimental modules features (deprecated).
-
 ### `--experimental-policy`
 
 <!-- YAML