Issue #26778: Fixed "a/an/and" typos in code comment and documentation.
diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index 24d4aec..0270e25 100644
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -1821,7 +1821,7 @@
     _type_specific_attributes = ['_labels', '_visible']
 
     def __init__(self, message=None):
-        """Initialize an BabylMessage instance."""
+        """Initialize a BabylMessage instance."""
         self._labels = []
         self._visible = Message()
         Message.__init__(self, message)