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/exceptions.c b/Python/exceptions.c
index 05e318e..b63daee 100644
--- a/Python/exceptions.c
+++ b/Python/exceptions.c
@@ -183,7 +183,7 @@
 {
     PyObject* self = PyTuple_GetItem(args, 0);
     if (!self) {
-	/* Watch out for being called to early in the bootstapping process */
+	/* Watch out for being called to early in the bootstrapping process */
 	if (PyExc_TypeError) {
 	    PyErr_SetString(PyExc_TypeError,
 	     "unbound method must be called with class instance 1st argument");