Corrections for a/an in code comments and documentation
diff --git a/Demo/metaclasses/index.html b/Demo/metaclasses/index.html
index eee473a..1675c63 100644
--- a/Demo/metaclasses/index.html
+++ b/Demo/metaclasses/index.html
@@ -222,7 +222,7 @@
means calling the metainstance, and this will return a real instance.
And what class is that an instance of? Conceptually, it is of course
an instance of our metainstance; but in most cases the Python runtime
-system will see it as an instance of a a helper class used by the
+system will see it as an instance of a helper class used by the
metaclass to implement its (non-meta) instances...
<P>Hopefully an example will make things clearer. Let's presume we