Addresses review comments on gh-134567

Author: garry-cairns

Doc/library/unittest.rst

@@ -1147,7 +1147,7 @@ Test cases
       :const:`logging.ERROR`).  The default is :const:`logging.INFO`.
 
       If given, *formatter* should be a :class:`logging.Formatter` object.
-      The default is a formatter with
+      The default is a formatter with format string
       ``"%(levelname)s:%(name)s:%(message)s"``
 
       The test passes if at least one message emitted inside the ``with``
@@ -1178,7 +1178,7 @@ Test cases
       .. versionadded:: 3.4
 
       .. versionchanged:: next
-         Now accepts a formatter argument so your assertions can match
+         Now accepts a *formatter* so your assertions can match
          a custom format where you are using one.
 
    .. method:: assertNoLogs(logger=None, level=None)

Misc/NEWS.d/next/Tests/2025-05-23-09-19-52.gh-issue-134567.hwEIMb.rst

@@ -1,2 +1,2 @@
-Expose log formatter to users in TestCase.assertLogs.
-:func:`unittest.TestCase.assertLogs` will now accept a formatter argument so your assertions can match a custom format where you are using one.
+Expose log formatter to users in TestCase.assertLogs.
+:func:`unittest.TestCase.assertLogs` will now optionally accept a formatter that will be used to format the strings in output if provided.