Merge branch 'docs-hchouraria-geo-registry-primary-port' into 'master'

Docs: Format comment to be more visible on website

See merge request gitlab-org/gitlab!64296

doc/administration/geo/replication/docker_registry.md

@@ -109,11 +109,14 @@ For each application and Sidekiq node on the **secondary** site:
 
 1. Copy `/var/opt/gitlab/gitlab-rails/etc/gitlab-registry.key` from the **primary** to the node.
 
-1. Edit `/etc/gitlab/gitlab.rb`:
+1. Edit `/etc/gitlab/gitlab.rb` and add:
 
    ```ruby
    gitlab_rails['geo_registry_replication_enabled'] = true
-   gitlab_rails['geo_registry_replication_primary_api_url'] = 'https://primary.example.com:5050/' # Primary registry address, it will be used by the secondary node to directly communicate to primary registry
+   
+   # Primary registry's hostname and port, it will be used by
+   # the secondary node to directly communicate to primary registry
+   gitlab_rails['geo_registry_replication_primary_api_url'] = 'https://primary.example.com:5050/' 
    ```
 
 1. Reconfigure the node for the change to take effect: