Fix more vale warnings

doc/.vale/gitlab/Uppercase.yml

...dministration/geo/disaster_recovery/bring_primary_back.md

doc/administration/geo/disaster_recovery/planned_failover.md

doc/administration/geo/replication/faq.md

doc/administration/geo/replication/remove_geo_site.md

doc/administration/geo/replication/troubleshooting.md

doc/administration/geo/replication/tuning.md

...administration/geo/replication/upgrading_the_geo_sites.md

doc/administration/geo/replication/usage.md

doc/administration/geo/setup/external_database.md

doc/administration/geo/setup/index.md

doc/administration/raketasks/geo.md

doc/development/geo.md

doc/development/geo/framework.md

doc/raketasks/backup_restore.md