Fix some anchor links in docs

[Wumpf]

What

Checklist

• [x] I have read and agree to Contributor Guide and the Code of Conduct

• [x] I've included a screenshot or gif (if applicable)

• [x] I have tested the web demo (if applicable):

  • Using examples from latest main build: rerun.io/viewer
  • Using full set of examples from nightly build: rerun.io/viewer

• [x] The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG

• [x] If applicable, add a new check to the release checklist!

• [x] If have noted any breaking changes to the log API in CHANGELOG.md and the migration guide

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[github-actions[bot]]

Latest documentation preview deployed successfully.

Result	Commit	Link
✅	3e940d12c1c72cd95b560887aefc54fde3183f6b	https://landing-dke3dcps5-rerun.vercel.app/docs

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[github-actions[bot]]

Your changes can be cherry-picked to docs-latest and will be deployed immediately after merging.