remove version note

Doc/library/string.rst

@@ -81,12 +81,11 @@ The constants defined in this module are:
 String Formatting
 -----------------
 
-Starting in Python 3.0, the built-in string class provides the ability to do
-complex variable substitutions and value formatting via the :func:`format`
-method described in :pep:`3101`.  The :class:`Formatter` class in the
-:mod:`string` module allows you to create and customize your own string
-formatting behaviors using the same implementation as the built-in
-:meth:`format` method.
+The built-in string class provides the ability to do complex variable
+substitutions and value formatting via the :func:`format` method described in
+:pep:`3101`.  The :class:`Formatter` class in the :mod:`string` module allows
+you to create and customize your own string formatting behaviors using the same
+implementation as the built-in :meth:`format` method.
 
 .. class:: Formatter