Merge branch 'ali/update-docs-to-check-for-invalid-index' into 'master'

Docs: Check validity after async index creation

See merge request gitlab-org/gitlab!71772

doc/development/adding_database_indexes.md

@@ -275,7 +275,8 @@ You can verify if the MR was deployed to GitLab.com by executing
 `/chatops run auto_deploy status <merge_sha>`. To verify existence of
 the index, you can:
 
-- Use a meta-command in #database-lab, such as: `\di <index_name>`
+- Use a meta-command in #database-lab, such as: `\d <index_name>`
+  - Ensure that the index is not [`invalid`](https://www.postgresql.org/docs/12/sql-createindex.html#:~:text=The%20psql%20%5Cd%20command%20will%20report%20such%20an%20index%20as%20INVALID)
 - Ask someone in #database to check if the index exists
 - With proper access, you can also verify directly on production or in a
 production clone