Update links to TW team handbook page
What does this MR do and why?
This updates links to the TW team's handbook page, as a straight find-and-replace.
Related issues
Related to gitlab#431921 (closed)
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How to set up and validate locally
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Configure a local GitLab Docs environment: https://gitlab.com/gitlab-org/gitlab-docs/-/blob/main/doc/setup.md.
Merge request acceptance checklist
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I have evaluated the MR acceptance checklist for this merge request.