Actions: Local actions are automatically allowed

[Simran-B]

Why:

The "Allow select action" mode does not require to add actions from the same owner/org to be added to the list. Tested with regular account, not org - please double-check. Is this actually by design?

What's being changed:

Add paragraph to point out that local actions are implicitly allowed.

https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/disabling-or-limiting-github-actions-for-a-repository#allowing-specific-actions-to-run

Check off the following:

• All of the tests are passing.
• I have reviewed my changes in staging.
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[janiceilene]

Thanks so much @Simran-B! I'll get this triaged for review 🎉

[lucascosti]

Thanks for pointing this out, @Simran-B! I pretty sure this is by design, but I will double check with the Actions engineering team to make sure before we make docs updates.