Fix guide URLs (in lib/primer/deprecations.yml)

[orhantoy]

The previous URLs are returning 404 at the moment.

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What are you trying to accomplish?

Fix guide URLs which I think are used for instance with ERB lint, which is where I originally saw the issue.

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Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

What approach did you choose and why?

Searched the docs and found replacement URLs.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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[changeset-bot]

🦋 Changeset detected

Latest commit: b201147

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Patch

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[jonrohan]

Thanks!