Update Geo UI screenshots in documentation

Summary

After we've released the new Geo node page design (tentatively %13.12), we'll want to update any screenshots in our documentation that show the old design.

Pages to Update

• https://docs.gitlab.com/ee/administration/geo/replication/configuration.html#step-6-verify-proper-functioning-of-the-secondary-node
• https://docs.gitlab.com/ee/administration/geo/replication/troubleshooting.html#check-the-health-of-the-secondary-node
• https://docs.gitlab.com/ee/administration/geo/disaster_recovery/planned_failover.html#ensure-geo-replication-is-up-to-date
• https://docs.gitlab.com/ee/administration/geo/disaster_recovery/background_verification.html#repository-verification