#2986 Correct and duplicate version-added message

Doc/library/difflib.rst

@@ -45,7 +45,7 @@ diffs. For comparing directories and files, see also, the :mod:`filecmp` module.
    the purpose of sequence matching. This heuristic can be turned off by setting
    the ``autojunk`` argument to ``False`` when creating the :class:`SequenceMatcher`.
 
-   .. versionadded:: 2.7
+   .. versionadded:: 2.7.1
       The *autojunk* parameter.
 
 .. class:: Differ
@@ -363,6 +363,9 @@ The :class:`SequenceMatcher` class has this constructor:
    The optional argument *autojunk* can be used to disable the automatic junk
    heuristic.
 
+   .. versionadded:: 2.7.1
+      The *autojunk* parameter.
+
    :class:`SequenceMatcher` objects have the following methods: