Remove extraneous comment block (#31865)

lib/ansible/cli/doc.py

@@ -12,9 +12,6 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
-#
-# ansible-vault is a script that encrypts/decrypts YAML files. See
-# http://docs.ansible.com/playbooks_vault.html for more details.
 
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type