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/Python/getargs.c b/Python/getargs.c
index 11754ef..3ed65a3 100644
--- a/Python/getargs.c
+++ b/Python/getargs.c
@@ -13,7 +13,7 @@
 /* XXX There are several unchecked sprintf or strcat calls in this file.
    XXX The only way these can become a danger is if some C code in the
    XXX Python source (or in an extension) uses ridiculously long names
-   XXX or riduculously deep nesting in format strings. */
+   XXX or ridiculously deep nesting in format strings. */
 
 #include "Python.h"