Merge pull request #8739 from tk0miya/refactor_doc2

doc: minor fix

doc/usage/restructuredtext/directives.rst

@@ -569,21 +569,21 @@ __ http://pygments.org/docs/lexers
 
            print 'Explicit is better than implicit.'
 
-      .. versionadded:: 1.3
-
       In order to cross-reference a code-block using either the
       :rst:role:`ref` or the :rst:role:`numref` role, it is necessary
       that both :strong:`name` and :strong:`caption` be defined. The
       argument of :strong:`name` can then be given to :rst:role:`numref`
       to generate the cross-reference. Example::
 
-	See :numref:`this-py` for an example.
+        See :numref:`this-py` for an example.
 
       When using :rst:role:`ref`, it is possible to generate a cross-reference
       with only :strong:`name` defined, provided an explicit title is
       given. Example::
 
-	See :ref:`this code snippet <this-py>` for an example.
+        See :ref:`this code snippet <this-py>` for an example.
+
+      .. versionadded:: 1.3
 
    .. rst:directive:option:: dedent: number
       :type: number or no value