Improve `gitlab-ctl replicate-geo-database` additional opts documentation

doc/gitlab-geo/database.md

@@ -395,7 +395,7 @@ data before running `pg_basebackup`.
     gitlab-ctl replicate-geo-database --slot-name=secondary_example --host=1.2.3.4
     ```
 
-    When prompted, enter the password you set up for the `gitlab_replicator`
+    When prompted, enter the _plaintext_ password you set up for the `gitlab_replicator`
     user in the first step.
 
     This command also takes a number of additional options. You can use `--help`
@@ -416,6 +416,8 @@ data before running `pg_basebackup`.
          replication slot automatically if it does not exist.
        - If you're repurposing an old server into a Geo secondary, you'll need to
          add `--force` to the command line.
+       - When not in a production machine you can disable backup step if you
+         really sure this is what you want by adding `--skip-backup`
 
 1. Verify that the secondary is configured correctly and that the primary is
    reachable: