Issue #6784: Strings from Python 2 can now be unpickled as bytes objects.

Initial patch by Merlijn van Deen.

I've added a few unrelated docstring fixes in the patch while I was at
it, which makes the documentation for pickle a bit more consistent.
diff --git a/Misc/ACKS b/Misc/ACKS
index 5e60f9b..798aaa0 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -293,6 +293,7 @@
 Jonathan Dasteel
 Pierre-Yves David
 A. Jesse Jiryu Davis
+Merlijn van Deen
 John DeGood
 Ned Deily
 Vincent Delft