Fix changelog entry

Author: aclark4life

doc/changelog.rst

@@ -6,8 +6,9 @@ Changes in Version 4.15.1 (XXXX/XX/XX)
 
 Version 4.15.1 is a bug fix release.
 
-- Fixed a bug in ``MongoClient.network_layer`` and ``AsyncMongoClient.network_layer``
-  that could cause an ``TimeoutError`` when connecting to servers.
+- Fixed a bug in ``AsyncMongoClient`` that caused a
+  ``ServerSelectionTimeoutError`` when used with `` with ``uvicorn`` and
+  ``uvloop``.
 
 Changes in Version 4.15.0 (2025/09/10)
 --------------------------------------