Remove removal notice for review requests

What does this MR do?

As per !84007 (comment 906103179), this notification was added before the feature was actually removed, so we need to revert the removal notification.

We still want the deprecation notice to make it into the 14.10 release, which is why I'm not reverting the whole related MR, just the removal part.

Related issues

Related to !84007 (comment 906103179)

Author's checklist

• Optional. Consider taking the GitLab Technical Writing Fundamentals course.
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If you are a GitLab team member and only adding documentation, do not add any of the following labels:

• ~"frontend"
• ~"backend"
• ~"type::bug"
• ~"database"

These labels cause the MR to be added to code verification QA issues.

Reviewer's checklist

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