Few documentation improvements from last demo session

doc/administration/geo/replication/configuration.md

-# Geo configuration
+# Geo configuration (omnibus)
 
 >**Note:**
 This is the documentation for the Omnibus GitLab packages. For installations
@@ -73,6 +73,7 @@ they must be manually replicated to the secondary.
 
     ```
     gitlab-ctl reconfigure
+    gitlab-ctl restart
     ```
 
 ### Step 2. Manually replicate primary SSH host keys
@@ -146,20 +147,20 @@ keys must be manually replicated to the secondary node.
 1. Click the **Add node** button.
 1. SSH into your GitLab **secondary** server and restart the services:
 
-   ```
-   gitlab-ctl restart
-   ```
+    ```bash
+    gitlab-ctl restart
+    ```
 
-   Check if there are any common issue with your Geo setup by running:
+    Check if there are any common issue with your Geo setup by running:
 
-   ```
-   gitlab-rake gitlab:geo:check
-   ```
+    ```bash
+    gitlab-rake gitlab:geo:check
+    ```
 
 1. SSH into your GitLab **primary** server and login as root to verify the
    secondary is reachable or there are any common issue with your Geo setup:
 
-    ```
+    ```bash
     gitlab-rake gitlab:geo:check
     ```
 

doc/administration/geo/replication/configuration_source.md

-# Geo configuration
+# Geo configuration (source)
 
 >**Note:**
 This is the documentation for installations from source. For installations

doc/administration/geo/replication/database.md

-# Geo database replication
+# Geo database replication (omnibus)
 
 >**Note:**
 This is the documentation for the Omnibus GitLab packages. For installations
@@ -165,9 +165,10 @@ The following guide assumes that:
     
     ##
     # Secondary addresses
+    # - replace '1.2.3.4' with the primary public or VPC address
     # - replace '5.6.7.8' with the secondary public or VPC address
     ##
-    postgresql['md5_auth_cidr_addresses'] = ['5.6.7.8/32']
+    postgresql['md5_auth_cidr_addresses'] = ['1.2.3.4/32','5.6.7.8/32']
 
     ##
     ## Replication settings

doc/administration/geo/replication/database_source.md

-# Geo database replication
+# Geo database replication (source)
 
 >**Note:**
 This is the documentation for installations from source. For installations

doc/development/geo.md

-# Geo
+# Geo (development)
 
 Geo feature requires that we orchestrate a lot of components together.
 For the Database we need to setup a streaming replication. Any operation on disk