Update autolinked references section for clarity

[eyalgal]

Clarify that redirect.github.com can be used to avoid backlinks in references and note its incompatibility with GitHub Enterprise Cloud with Data Residency.

Why:

Closes:

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

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.

[Copilot]

Pull Request Overview

This PR adds a clarification note about the limitations of using redirect.github.com for avoiding backlinks in autolinked references, specifically noting its incompatibility with GitHub Enterprise Cloud with Data Residency.

• Adds a note block clarifying that redirect.github.com is not supported with GitHub Enterprise Cloud with Data Residency (ghe.com)

[Copilot]

The text 'GitHub Enterprise Cloud with Data Residency' should use the appropriate Liquid variable instead of hardcoded text. Please check the data/variables directory for the correct variable, likely in data/variables/product.yml or data/variables/enterprise.yml.

[github-actions]

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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
get-started/writing-on-github/working-with-advanced-formatting/autolinked-references-and-urls.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14

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

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[github-actions]

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