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/Modules/getpath.c b/Modules/getpath.c
index 876bac0..0807fa3 100644
--- a/Modules/getpath.c
+++ b/Modules/getpath.c
@@ -92,7 +92,7 @@
  * That's it!
  *
  * Well, almost.  Once we have determined prefix and exec_prefix, the
- * preprocesor variable PYTHONPATH is used to construct a path.  Each
+ * preprocessor variable PYTHONPATH is used to construct a path.  Each
  * relative path on PYTHONPATH is prefixed with prefix.  Then the directory
  * containing the shared library modules is appended.  The environment
  * variable $PYTHONPATH is inserted in front of it all.  Finally, the