Improve documentation

radicale/auth/none.py

@@ -17,6 +17,11 @@
 # You should have received a copy of the GNU General Public License
 # along with Radicale.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+A dummy backend that accepts any username and password.
+
+"""
+
 from radicale import auth