Merge branch 'update-db-docs-allowed-fields' into 'master'

Add sharding_key_issue_url to allowed DB dictionary fields

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150594



Merged-by: Dylan Griffith <dyl.griffith@gmail.com>
Approved-by: Dylan Griffith <dyl.griffith@gmail.com>
Co-authored-by: Tiger <twatson@gitlab.com>

spec/db/docs_spec.rb

@@ -22,6 +22,7 @@
         allow_cross_foreign_keys
         desired_sharding_key_migration_job_name
         exempt_from_sharding
+        sharding_key_issue_url
       ]
     end