Spelling fixes supplied by Rob W. W. Hooft. All these are fixes in either
comments, docstrings or error messages. I fixed two minor things in
test_winreg.py ("didn't" -> "Didn't" and "Didnt" -> "Didn't").

There is a minor style issue involved: Guido seems to have preferred English
grammar (behaviour, honour) in a couple places. This patch changes that to
American, which is the more prominent style in the source. I prefer English
myself, so if English is preferred, I'd be happy to supply a patch myself ;)
diff --git a/Include/cStringIO.h b/Include/cStringIO.h
index cc62c90..fac5f05 100644
--- a/Include/cStringIO.h
+++ b/Include/cStringIO.h
@@ -71,7 +71,7 @@
 
 */
 
-/* Basic fuctions to manipulate cStringIO objects from C */
+/* Basic functions to manipulate cStringIO objects from C */
 
 static struct PycStringIO_CAPI {