Updated two more references to old name

Author: IanLee1521

CONTRIBUTING.rst

@@ -1,4 +1,4 @@
-Contributing to ``pep8``
-========================
+Contributing to ``pycodestyle``
+===============================
 
 Please see the `developer notes <https://pycodestyle.readthedocs.io/en/latest/developer.html>`_

docs/intro.rst

@@ -106,7 +106,8 @@ Or you can display how often each error was found::
   612     W601 .has_key() is deprecated, use 'in'
   1188    W602 deprecated form of raising exception
 
-You can also make pep8.py show the error text in different formats by using --format having options default/pylint/custom::
+You can also make pycodestyle.py show the error text in different formats by
+using --format having options default/pylint/custom::
 
   $ pycodestyle testsuite/E40.py --format=default
   testsuite/E40.py:2:10: E401 multiple imports on one line