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/Objects/dictobject.c b/Objects/dictobject.c
index 76417b9..819fadd 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -185,7 +185,7 @@
 		/* Cycle through GF(2^n)-{0} */
 		incr = incr << 1;
 		if (incr > mask)
-			incr ^= mp->ma_poly; /* This will implicitely clear
+			incr ^= mp->ma_poly; /* This will implicitly clear
 						the highest bit */
 	}
 }