One-line docstrings.

Sigh.  That is *never* gonna look right to me.

gcloud/storage/key.py

@@ -15,13 +15,11 @@ def _scalar_property(fieldname):
     """Create a property descriptor around the :class:`_PropertyMixin` helpers.
     """
     def _getter(self):
-        """Scalar property getter.
-        """
+        """Scalar property getter."""
         return self.properties[fieldname]
 
     def _setter(self, value):
-        """Scalar property setter.
-        """
+        """Scalar property setter."""
         self._patch_properties({fieldname: value})
 
     return property(_getter, _setter)