Update doc/changelog.rst

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: NoahStapp

doc/changelog.rst

@@ -13,7 +13,7 @@ PyMongo 4.17 brings a number of changes including:
 - Added the :meth:`~pymongo.asynchronous.client_session.AsyncClientSession.bind` and :meth:`~pymongo.client_session.ClientSession.bind` methods
   that allow users to bind a session to all database operations within the scope of a context manager instead of having to explicitly pass the session to each individual operation.
   See <PLACEHOLDER> for examples and more information.
-- OCSP authentication now uses the more secure SHA-256 hashing algorithm for certificate verification instead of SHA-1.
+- OCSP request certificate identifiers (CertID) now use the SHA-256 hashing algorithm instead of SHA-1.
 
 Changes in Version 4.16.0 (2026/01/07)
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