Merge branch 'docs-cgomes-dbreviewer-doc-change' into 'master'

Updated database reviewer role steps

See merge request gitlab-org/gitlab!18711

doc/development/database_review.md

@@ -47,6 +47,13 @@ A database **reviewer**'s role is to:
   reassign MR to the database **maintainer** suggested by Reviewer
   Roulette.
 
+#### When there are no database maintainers available
+
+Currently we have a [critical shortage of database maintainers](https://gitlab.com/gitlab-org/gitlab/issues/29717). Until we are able to increase the number of database maintainers to support the volume of reviews, we have implemented this temporary solution. If the database **reviewer** cannot find an available database **maintainer** then:
+
+1. Assign the MR for a second review by a **database trainee maintainer** for further review.
+1. Once satisfied with the review process, and if the database **maintainer** is still not available, skip the database maintainer approval step and assign the merge request to a backend maintainer for final review and approval.
+
 A database **maintainer**'s role is to:
 
 - Perform the final database review on the MR.