#8000: fix deprecated directive. What a shame to lose that glorious issue...

#8000: fix deprecated directive.  What a shame to lose that glorious issue number to such a minor bug :)

Doc/library/mutex.rst

@@ -6,7 +6,7 @@
    :synopsis: Lock and queue for mutual exclusion.
    :deprecated:
 
-.. deprecated::
+.. deprecated:: 2.6
    The :mod:`mutex` module has been removed in Python 3.0.
 
 .. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>