Fix a bunch of typos in documentation, docstrings and comments.
(From SF patch #810751)
diff --git a/Demo/metaclasses/index.html b/Demo/metaclasses/index.html
index af9caa9..eee473a 100644
--- a/Demo/metaclasses/index.html
+++ b/Demo/metaclasses/index.html
@@ -547,7 +547,7 @@
all class variables<P>
<LI>Implement a different way to store instance variables (e.g. in a
-list kept outside the the instance but indexed by the instance's id())<P>
+list kept outside the instance but indexed by the instance's id())<P>
<LI>Automatically wrap or trap all or certain methods