Improve anonymize_content docstring

misago/users/authbackends.py

@@ -7,8 +7,8 @@ UserModel = get_user_model()
 
 class MisagoBackend(ModelBackend):
     def authenticate(self, request, username=None, password=None, **kwargs):
-        if username is None:
-            username = kwargs.get(UserModel.USERNAME_FIELD)
+        if kwargs.get('email'):
+            username = kwargs['email']  # Bias to email if it was passed explictly
 
         try:
             user = UserModel.objects.get_by_username_or_email(username)

misago/users/models/user.py

@@ -317,7 +317,11 @@ class User(AbstractBaseUser, PermissionsMixin):
         self.save(update_fields=['is_active', 'is_deleting_account'])
 
     def anonymize_content(self):
-        # Replace username on associated items with anonymous one
+        """Replaces username with anonymized one, then send anonymization signal.
+
+        Items associated with this user then anonymize their user-specific data
+        like username or IP addresses.
+        """
         self.username = settings.MISAGO_ANONYMOUS_USERNAME
         self.slug = slugify(self.username)