Updated proxy secondary documentation with SSH support

doc/administration/geo/replication/configuration.md

@@ -316,17 +316,15 @@ It is important to note that selective synchronization:
 
 ### Git operations on unreplicated respositories
 
-> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/2562) in GitLab 12.10.
+> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/2562) in GitLab 12.10 for HTTP(S) and in GitLab 13.0 for SSH.
 
-Git clone, pull, and push operations over HTTP(S) are supported for repositories that
+Git clone, pull, and push operations over HTTP(S) and SSH are supported for repositories that
 exist on the **primary** node but not on **secondary** nodes. This situation can occur
 when:
 
 - Selective synchronization does not include the project attached to the repository.
 - The repository is actively being replicated but has not completed yet.
 
-SSH [support is planned](https://gitlab.com/groups/gitlab-org/-/epics/2562).
-
 ## Upgrading Geo
 
 See the [updating the Geo nodes document](updating_the_geo_nodes.md).