Reminder to remove library from pyrightconfig (#14377)

Author: donBarbos

CONTRIBUTING.md

@@ -463,7 +463,8 @@ steps:
 4. When a new version of the package was automatically uploaded to PyPI
    (which can take up to a day), open a PR to remove the stubs.
 
-If feeling kindly, please update [mypy](https://github.com/python/mypy/blob/master/mypy/stubinfo.py)
+Don't forget to make sure the library is not in the [`pyrightconfig.stricter.json`](./pyrightconfig.stricter.json)
+exclusion list. If feeling kindly, please update [mypy](https://github.com/python/mypy/blob/master/mypy/stubinfo.py)
 for any stub obsoletions or removals.
 
 ### Marking PRs as "deferred"