[2.1.x] Removed duplicate words in various comments.

Backport of a73cf8110e from master

django/contrib/gis/db/backends/base/features.py

@@ -27,7 +27,7 @@ class BaseSpatialFeatures:
     supports_null_geometries = True
     # Are empty geometries supported?
     supports_empty_geometries = False
-    # Can the the function be applied on geodetic coordinate systems?
+    # Can the function be applied on geodetic coordinate systems?
     supports_distance_geodetic = True
     supports_length_geodetic = True
     supports_perimeter_geodetic = False

django/contrib/messages/storage/fallback.py

@@ -6,7 +6,7 @@ from django.contrib.messages.storage.session import SessionStorage
 class FallbackStorage(BaseStorage):
     """
     Try to store all messages in the first backend. Store any unstored
-    messages in each subsequent backend backend.
+    messages in each subsequent backend.
     """
     storage_classes = (CookieStorage, SessionStorage)
 

django/core/management/__init__.py

@@ -118,8 +118,8 @@ def call_command(command_name, *args, **options):
     }
     arg_options = {opt_mapping.get(key, key): value for key, value in options.items()}
     parse_args = [str(a) for a in args]
-    # Any required arguments which are passed in via **options must must be
-    # passed to parse_args().
+    # Any required arguments which are passed in via **options must be passed
+    # to parse_args().
     parse_args += [
         '{}={}'.format(min(opt.option_strings), arg_options[opt.dest])
         for opt in parser._actions if opt.required and opt.dest in options

django/db/models/sql/query.py

@@ -1458,8 +1458,8 @@ class Query:
         joins = [alias]
         # The transform can't be applied yet, as joins must be trimmed later.
         # To avoid making every caller of this method look up transforms
-        # directly, compute transforms here and and create a partial that
-        # converts fields to the appropriate wrapped version.
+        # directly, compute transforms here and create a partial that converts
+        # fields to the appropriate wrapped version.
 
         def final_transformer(field, alias):
             return field.get_col(alias)

django/test/testcases.py

@@ -605,7 +605,7 @@ class SimpleTestCase(unittest.TestCase):
 
     def assertRaisesMessage(self, expected_exception, expected_message, *args, **kwargs):
         """
-        Assert that expected_message is found in the the message of a raised
+        Assert that expected_message is found in the message of a raised
         exception.
 
         Args:

django/utils/tree.py

@@ -52,7 +52,7 @@ class Node:
         return obj
 
     def __len__(self):
-        """Return the the number of children this node has."""
+        """Return the number of children this node has."""
         return len(self.children)
 
     def __bool__(self):