Document merge queue bypass for restricted creations

[JanJeter]

Why:

The ruleset documentation explains how the Restrict creations rule works, but it does not mention that merge queue branches also need permission to be created.

When this rule applies to all branches, merge queue branches matching
gh-readonly-queue/{base_branch} can be blocked unless the GitHub Merge Queue app is added to the bypass list.

Closes #45334

What's being changed:

Add documentation explaining that the GitHub Merge Queue app must be added to the bypass list when the Restrict creations rule applies to merge queue branches.

Testing:

• Ran git diff --check.
• Verified that the change is limited to the relevant ruleset documentation.

[github-actions]

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Table of review links

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Source	Review	Production	What Changed
repositories/configuring-branches-and-merges-in-your-repository/managing-rulesets/available-rules-for-rulesets.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[subatoi]

This isn't open to contributors yet, so I'm going to close this out. We haven't had time to do a proper assessment and we don't know whether it's something we need to fix internally, or how many articles are affected and what the scope of the fix will be. Sorry this won't have been the outcome you were hoping for, and please keep an eye out for issues marked help wanted 💛