Addressed comments in changelog.

Author: caseyclements

doc/changelog.rst

@@ -51,9 +51,9 @@ PyMongo 4.13 brings a number of changes including:
   or the `migration guide <https://www.mongodb.com/docs/languages/python/pymongo-driver/current/reference/migration/>`_ for more information.
 - Fixed a bug where :class:`pymongo.write_concern.WriteConcern` repr was not eval-able
   when using ``w="majority"``.
-- Ignored bits in a BSON BinaryVector of PACKED_BIT dtype should be set to zero.
-  On writes, this is enforced and is a breaking change.
-  Reads from the database will not fail, however a warning will be triggered.
+- When padding is set, ignored bits in a BSON BinaryVector of PACKED_BIT dtype should be set to zero.
+  When encoding, this is enforced and is a breaking change.
+  It is not enforced when decoding, so reading from the database will not fail, however a warning will be triggered.
 
 Issues Resolved
 ...............