Improve comment on Rails database password

doc/administration/geo/replication/database.md

@@ -84,7 +84,9 @@ The following guide assumes that:
     # Fill with the hash generated by `gitlab-ctl pg-password-md5 gitlab`
     postgresql['sql_user_password'] = 'fca0b89a972d69f00eb3ec98a5838484'
 
-    # If you have HA setup, this must be present in all nodes as well
+    # Every node that runs Unicorn or Sidekiq needs to have the database
+    # password specified as below. If you have a high-availability setup, this
+    # must be present in all application nodes.
     gitlab_rails['db_password'] = 'mypassword'
     ```
 

doc/administration/geo/replication/updating_the_geo_nodes.md

@@ -46,9 +46,10 @@ authentication method.
     # Fill with the hash generated by `gitlab-ctl pg-password-md5 gitlab`
     postgresql['sql_user_password'] = 'fca0b89a972d69f00eb3ec98a5838484'
 
-    # If you have HA setup, this must be present in all nodes as well
-    gitlab_rails['db_password'] = 'mypassword'
-    ```
+    # Every node that runs Unicorn or Sidekiq needs to have the database
+    # password specified as below. If you have a high-availability setup, this
+    # must be present in all application nodes.
+    gitlab_rails['db_password'] = 'mypassword' ```
 
     Still in the configuration file, locate and remove the `trust_auth_cidr_address`:
 
@@ -69,7 +70,9 @@ authentication method.
     # Fill with the hash generated by `gitlab-ctl pg-password-md5 gitlab`
     postgresql['sql_user_password'] = 'fca0b89a972d69f00eb3ec98a5838484'
 
-    # If you have HA setup, this must be present in all nodes as well
+    # Every node that runs Unicorn or Sidekiq needs to have the database
+    # password specified as below. If you have a high-availability setup, this
+    # must be present in all application nodes.
     gitlab_rails['db_password'] = 'mypassword'
 
     # Enable Foreign Data Wrapper