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/pre.py b/Lib/pre.py
index 602980a..3086bd4 100644
--- a/Lib/pre.py
+++ b/Lib/pre.py
@@ -77,7 +77,7 @@
     M  MULTILINE   "^" matches the beginning of lines as well as the string.
                    "$" matches the end of lines as well as the string.
     S  DOTALL      "." matches any character at all, including the newline.
-    X  VERBOSE     Ignore whitespaces and comments for nicer looking RE's.
+    X  VERBOSE     Ignore whitespace and comments for nicer looking RE's.
 
 This module also defines an exception 'error'.