Update readme pursuant to ad672f1 (numpy#71)

Author: jnothman

README.rst

@@ -9,17 +9,9 @@ Numpy's documentation uses several custom extensions to Sphinx.  These
 are shipped in this ``numpydoc`` package, in case you want to make use
 of them in third-party projects.
 
-The following extensions are available:
-
-  - ``numpydoc``: support for the Numpy docstring format in Sphinx, and add
-    the code description directives ``np:function``, ``np-c:function``, etc.
-    that support the Numpy docstring syntax.
-
-  - ``numpydoc.traitsdoc``: For gathering documentation about Traits attributes.
-
-  - ``numpydoc.plot_directive``: Adaptation of Matplotlib's ``plot::``
-    directive. Note that this implementation may still undergo severe
-    changes or eventually be deprecated.
+The ``numpydoc`` extension provides support for the Numpy docstring format in
+Sphinx, and adds the code description directives ``np:function``,
+``np-c:function``, etc.  that support the Numpy docstring syntax.
 
 See `A Guide to NumPy/SciPy Documentation <https://github.com/numpy/numpy/blob/master/doc/HOWTO_DOCUMENT.rst.txt>`_
 for how to write docs that use this extension.