Issue #25523: Correct "a" article to "an" article

This changes the main documentation, doc strings, source code comments, and a
couple error messages in the test suite. In some cases the word was removed
or edited some other way to fix the grammar.

1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/test/test_weakref.py b/Lib/test/test_weakref.py
index 212cf34..4313c1d 100644
--- a/Lib/test/test_weakref.py
+++ b/Lib/test/test_weakref.py
@@ -934,7 +934,7 @@ class SubclassableWeakrefTestCase(TestBase):
 class WeakMethodTestCase(unittest.TestCase):
 
     def _subclass(self):
-        """Return a Object subclass overriding `some_method`."""
+        """Return an Object subclass overriding `some_method`."""
         class C(Object):
             def some_method(self):
                 return 6