Issue #26778: Fixed "a/an/and" typos in code comment and documentation.
diff --git a/Lib/lib2to3/refactor.py b/Lib/lib2to3/refactor.py
index bd23897..98386c5 100644
--- a/Lib/lib2to3/refactor.py
+++ b/Lib/lib2to3/refactor.py
@@ -184,7 +184,7 @@
 
         Args:
             fixer_names: a list of fixers to import
-            options: an dict with configuration.
+            options: a dict with configuration.
             explicit: a list of fixers to run even if they are explicit.
         """
         self.fixers = fixer_names