update redis server details

doc/administration/high_availability/redis.md

@@ -48,15 +48,15 @@ Redis.
     redis['password'] = 'Redis Password'
     ```
-1. Run `sudo gitlab-ctl reconfigure` to install and configure PostgreSQL.
+1. Run `sudo touch /etc/gitlab/skip-auto-migrations` to prevent database migrations
+   from running on upgrade. Only the primary GitLab application server should
+   handle migrations.
+
+1. Run `sudo gitlab-ctl reconfigure` to install and configure Redis.
     > **Note**: This `reconfigure` step will result in some errors.
       That's OK - don't be alarmed.
-1. Run `touch /etc/gitlab/skip-auto-migrations` to prevent database migrations
-   from running on upgrade. Only the primary GitLab application server should
-   handle migrations.
-
 ## Experimental Redis Sentinel support
 > [Introduced][ce-1877] in GitLab 8.11.