Fix capitalization issues

doc/administration/geo/disaster_recovery/index.md

@@ -139,7 +139,7 @@ do this manually.
    sudo gitlab-pg-ctl promote
    ```
 
-   In GitLab 12.8 and earlier, see [Message: "sudo: gitlab-pg-ctl: command not found"](../replication/troubleshooting.md#message-sudo-gitlab-pg-ctl-command-not-found).
+   In GitLab 12.8 and earlier, see [Message: `sudo: gitlab-pg-ctl: command not found`](../replication/troubleshooting.md#message-sudo-gitlab-pg-ctl-command-not-found).
 
 1. Edit `/etc/gitlab/gitlab.rb` on every machine in the **secondary** to
    reflect its new status as **primary** by removing any lines that enabled the

doc/administration/geo/replication/troubleshooting.md

@@ -514,7 +514,7 @@ or `gitlab-ctl promote-to-primary-node`, either:
   bug](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/22021) was
   fixed.
 
-### Message: "sudo: gitlab-pg-ctl: command not found"
+### Message: `sudo: gitlab-pg-ctl: command not found`
 
 When
 [promoting a **secondary** node with HA](../disaster_recovery/index.md#promoting-a-secondary-node-with-ha),