Move versionadded for ensurepip into the standard location (right after title)

Doc/library/ensurepip.rst

@@ -5,6 +5,8 @@
    :synopsis: Bootstrapping the ``pip`` installer into an existing Python
               installation or virtual environment.
 
+.. versionadded:: 3.4
+
 The :mod:`ensurepip` package provides support for bootstrapping the ``pip``
 installer into an existing Python installation or virtual environment. This
 bootstrapping approach reflects the fact that ``pip`` is an independent
@@ -18,8 +20,6 @@ needed if installing ``pip`` was skipped when installing Python (or
 when creating a virtual environment) or after explicitly uninstalling
 ``pip``.
 
-.. versionadded:: 3.4
-
 .. note::
 
    This module *does not* access the internet. All of the components