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/rfc822.py b/Lib/rfc822.py
index bb17614..6473149 100644
--- a/Lib/rfc822.py
+++ b/Lib/rfc822.py
@@ -193,7 +193,7 @@
         
         You may override this method if your application wants
         to bend the rules, e.g. to strip trailing whitespace,
-        or to recognise MH template separators ('--------').
+        or to recognize MH template separators ('--------').
         For convenience (e.g. for code reading from sockets) a
         line consisting of \r\n also matches.                
         """