Remove circular link in warning

[chohlasa]

Why:

Closes: #38152

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

This links to a page that does not contain additional information as was promised. This creates a circular link on the destination page. I was instructed by @Sharra-writes to open this PR to remove this link.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
pages/configuring-a-custom-domain-for-your-github-pages-site/managing-a-custom-domain-for-your-github-pages-site.md	fpt ghec	fpt ghec	from reusable
pages/configuring-a-custom-domain-for-your-github-pages-site/troubleshooting-custom-domains-and-github-pages.md	fpt ghec	fpt ghec	from reusable
pages/configuring-a-custom-domain-for-your-github-pages-site/verifying-your-custom-domain-for-github-pages.md	fpt ghec	fpt ghec	from reusable

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

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[Sharra-writes]

Awesome, looks great! I'll get it merged once checks are passing.

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