Docstring changes made based on comments:

kjartankg · kjartankg · commit d2d997156f50 · 2016-03-26T15:49:36.000+01:00
* NOTE: cnaged to .. note ::
* Raises section removed Colormap.reversed docstring
* methods mentioned in a new file under whats_new
diff --git a/doc/users/whats_new/reversed_colormap.rst b/doc/users/whats_new/reversed_colormap.rst
@@ -0,0 +1,7 @@
+Colormap reversed method
+------------------------
+
+The methods :meth:`~matplotlib.colors.LinearSegmentedColormap.reversed` and
+:meth:`~matplotlib.colors.ListedColormap.reversed` return a reversed
+instance of the Colormap. This implements a way for any Colormap to be
+reversed.
diff --git a/lib/matplotlib/colors.py b/lib/matplotlib/colors.py
@@ -669,19 +669,14 @@ def reversed(self, name=None):
         """
         Make a reversed instance of the Colormap.
 
-        NOTE: Function not implemented for base class.
+        .. note :: Function not implemented for base class.
 
         Parameters
         ----------
         name : str, optional
             The name for the reversed colormap. If it's None the
             name will be the name of the parent colormap + "_r".
 
-        Raises
-        ------
-        NotImplementedError
-            Function not implemented for base class.
-
         Notes
         -----
         See :meth:`LinearSegmentedColormap.reversed` and
