Remove section about disabling TOC, it is no longer possible

[IlanCosman]

Why:

Closes #12399

What's being changed:

Removes the outdated section.

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• I have reviewed my changes in staging (look for "Automatically generated comment" and click Modified to view your latest changes).
• For content changes, I have completed the self-review checklist.

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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

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Source	Staging	Production	What Changed
content/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-readmes.md	Modified	Original

[ramyaparimi]

@IlanCosman
Thanks so much for opening a PR! I'll get this triaged for review ⚡

[ethanpalm]

Thanks for creating this PR and opening the corresponding issue, @IlanCosman! Your changes look good to go. I'll get this merged once all the checks are passing.

Thank you for taking the time to contribute to the GitHub docs ✨

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Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours. If you're looking for your next contribution, check out our help wanted issues ⚡