gh-92417: `unittest.mock` docs: remove references to Python <2.6 (GH-92539)

Doc/library/unittest.mock-examples.rst

@@ -660,7 +660,7 @@ Applying the same patch to every test method
 
 If you want several patches in place for multiple test methods the obvious way
 is to apply the patch decorators to every method. This can feel like unnecessary
-repetition. For Python 2.6 or more recent you can use :func:`patch` (in all its
+repetition. Instead, you can use :func:`patch` (in all its
 various forms) as a class decorator. This applies the patches to all test
 methods on the class. A test method is identified by methods whose names start
 with ``test``::

Doc/library/unittest.mock.rst

@@ -2381,7 +2381,7 @@ FILTER_DIR
 .. data:: FILTER_DIR
 
 :data:`FILTER_DIR` is a module level variable that controls the way mock objects
-respond to :func:`dir` (only for Python 2.6 or more recent). The default is ``True``,
+respond to :func:`dir`. The default is ``True``,
 which uses the filtering described below, to only show useful members. If you
 dislike this filtering, or need to switch it off for diagnostic purposes, then
 set ``mock.FILTER_DIR = False``.