edit docstrings

Author: alimanfoo

numcodecs/msgpacks.py

@@ -10,11 +10,7 @@
 
 
 class MsgPack(Codec):
-    """Codec to encode data as msgpacked bytes. Useful for encoding an array of Python strings
-
-    Raises
-    ------
-    encoding a non-object dtyped ndarray will raise ValueError
+    """Codec to encode data as msgpacked bytes. Useful for encoding an array of Python strings.
 
     Examples
     --------
@@ -29,6 +25,10 @@ class MsgPack(Codec):
     --------
     :class:`numcodecs.pickles.Pickle`
 
+    Notes
+    -----
+    Requires `msgpack-python <https://pypi.python.org/pypi/msgpack-python>`_ to be installed.
+
     """  # flake8: noqa
 
     codec_id = 'msgpack'

numcodecs/pickles.py

@@ -21,10 +21,6 @@ class Pickle(Codec):
     protocol : int, defaults to pickle.HIGHEST_PROTOCOL
         The protocol used to pickle data.
 
-    Raises
-    ------
-    Encoding a non-object dtyped ndarray will raise ValueError.
-
     Examples
     --------
     >>> import numcodecs as codecs