Removed link for ReST since it fails in the check too often

doc/contributing.rst

@@ -204,7 +204,7 @@ will provide you with a target ``test_awesome_feature.py_run``.
 --------------------------------------------------------------------------------
 Writing Documentation
 --------------------------------------------------------------------------------
-To create documentation, we use |sphinx|_ to go from |restructuredtext|_
+To create documentation, we use |sphinx|_ to go from |restructuredtext|
 (|restructuredtext_abrv|) files and API documentation in source files to HTML
 or man pages.
 
@@ -555,7 +555,6 @@ Now tests should be available by ``make check``, ``make codetest`` and
 ``make test_something.py_run``.
 
 
-.. _restructuredtext: http://docutils.sourceforge.net/rst.html
 .. |fedora| replace:: Fedora
 .. |nameattr| replace:: :attr:`__name__`