Add space after full stop in ansible-galaxy help

Space between full stop and next word missing in a few places.
Before
```

  -p ROLES_PATH, --roles-path=ROLES_PATH
                        The path to the directory containing your roles.The
                        default is the roles_path configured in your
                        ansible.cfg file (/etc/ansible/roles if not
                        configured)
```

After
````
p ROLES_PATH, --roles-path=ROLES_PATH
                        The path to the directory containing your roles. The
                        default is the roles_path configured in your
                        ansible.cfg file (/etc/ansible/roles if not
                        configured)
````