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/Lib/aifc.py b/Lib/aifc.py
index 0af6622..e00b23f 100644
--- a/Lib/aifc.py
+++ b/Lib/aifc.py
@@ -82,7 +82,7 @@
   close()     -- close the instance (make it unusable)
 The position returned by tell(), the position given to setpos() and
 the position of marks are all compatible and have nothing to do with
-the actual postion in the file.
+the actual position in the file.
 The close() method is called automatically when the class instance
 is destroyed.