doc: Change options at STEP 5 in CONTRIBUTING.md

PR-URL: #12830
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>

CONTRIBUTING.md

@@ -182,7 +182,14 @@ If you are updating tests and just want to run a single test to check it, you
 can use this syntax to run it exactly as the test harness would:
 
 ```text
-$ python tools/test.py -v --mode=release parallel/test-stream2-transform
+$ python tools/test.py -J --mode=release parallel/test-stream2-transform
+```
+
+If you want to check the other options, please refer to the help by using
+the `--help` option
+
+```text
+$ python tools/test.py --help
 ```
 
 You can run tests directly with node: