changed rsync and rsync-auto to be primary commands

At the moment rsync and rsync-auto are not listed in the list of common commands.

example list of common commands with this patch:

```
[...]
     reload       restarts vagrant machine, loads new Vagrantfile configuration
     resume       resume a suspended vagrant machine
     rsync        syncs rsync synced folders to remote machine
     rsync-auto   syncs rsync synced folders automatically when files change
     share        share your Vagrant environment with anyone in the world
[...]
```