Update about-code-owners.md

[hayden-t]

Why:

Highlights an easily missed security vulnerability

What's being changed (if available, include any code snippets, screenshots, or gifs):

ive tested this, and unless codeowners is itself protected by codeowners, rules can be changed....

Check off the following:

• [yes ] I have reviewed my changes in staging, available via the View deployment link in this PR's timeline.

  • For content changes, you will also see an automatically generated comment with links directly to pages you've modified. The comment won't appear if your PR only edits files in the data directory.

• [yes ] For content changes, I have completed the self-review checklist.

[welcome]

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[github-actions]

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners.md	fpt ghec ghes@ 3.11 3.10 3.9 3.8	fpt ghec ghes@ 3.11 3.10 3.9 3.8

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

[steveward]

Thanks for the PR @hayden-t. I'll get this triaged for review. ⚡

[felicitymay]

@hayden-t - many thanks for flagging how to use your CODEOWNERS file more securely for branch protection 💖

I'm going to merge a couple of changes to bring the content into line with our current style guide and recheck the preview. If that looks okay, then we should be able to merge your changes.

[felicitymay]

Thanks for this contribution. It will help our users create more secure repositories.

[github-actions]

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