This updates the remaining stale auth hook references after the auth
hooks guide moved from hash anchors to dedicated subpages.
It switches the RBAC guide to the current custom access token hook page,
updates the MFA verification hook reference in both the docs error-code
source and the shared-data export, and fixes the matching custom access
token hook comments in the Slack Clone SQL examples.
Testing: not run. Link-target updates only.
Refs #46947
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## Summary by CodeRabbit
## Release Notes
* **Documentation**
* Updated error code and auth hook documentation reference links to
point to more specific canonical documentation pages, improving accuracy
of references for developers.
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* fix: revoke role on public for hooks
* fix: update SQL editor queries
* fix: update examples
* fix: update RBAC doc
* fix: update description to describe why we revoke public
* fix: correct use of we
* fix: run prettier
* fix: remove unintentionally added files
Peter Chen J.