Rohit Nayak

Document reference tables

1

Generic reference tables page as a complement to https://github.com/vitessio/vitess/pull/16787. Related page: https://deploy-preview-1849--vitess.netlify.app/docs/21.0/reference/vreplication/reference_tables/

### Feature Description This is a tracking issue for the upcoming release of Vitess 21. The aim is to host all the pending todos and document the process some more....

CI: Debugging flaky TestMoveTablesUnsharded

1

## Description ## Related Issue(s) ## Checklist - [ ] "Backport to:" labels have been added if this change should be back-ported to release branches - [ ] If this...