docs: Specify that node.js exits with status code 9 if no file is provided instead of throwing

Author: juanibe

doc/api/cli.md

@@ -3056,7 +3056,7 @@ Use `--watch-path` to specify what paths to watch.
 This flag cannot be combined with
 `--check`, `--eval`, `--interactive`, or the REPL.
 
-Note: The `--watch` flag requires a file path as an argument. It does not support being used with `--run` or inline script input. If no file is provided, Node.js will throw an error.
+Note: The `--watch` flag requires a file path as an argument. It does not support being used with `--run` or inline script input. If no file is provided, Node.js will exit with status code 9.
 
 ```bash
 node --watch index.js