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/strtod.c b/Python/strtod.c
index a0991d5..0673fca 100644
--- a/Python/strtod.c
+++ b/Python/strtod.c
@@ -69,7 +69,7 @@
 	register char *sp, *dp;
 	register int c;
 	char *buforg, *buflim;
-	char buffer[64];		/* 45-digit significand + */
+	char buffer[64];		/* 45-digit significant + */
 					/* 13-digit exponent */
 	sp = str;
 	while (*sp == ' ') sp++;