Clean up the changes doc

CHANGES.rst

@@ -10,7 +10,6 @@ Unreleased
 - Fixed issue with deferred fields causing DoesNotExist error (gh-678)
 - Added HistoricOneToOneField (gh-1394)
 
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 3.7.0 (2024-05-29)
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@@ -113,12 +112,6 @@ Unreleased
 - Started using ``exists`` query instead of ``count`` in ``populate_history`` command (gh-982)
 - Add basic support for many-to-many fields (gh-399)
 - Added support for Django 4.1 (gh-1021)
-- Added ``tracked_fields`` attribute to historical models (gh-1038)
-- Fixed ``KeyError`` when running ``clean_duplicate_history`` on models with ``excluded_fields`` (gh-1038)
-- Added support for Python 3.11 (gh-1053)
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-=======
-
 
 3.1.1 (2022-04-23)
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