minor: fixing typo

Author: Sam Kleinman

source/index.txt

@@ -63,8 +63,6 @@ documents:
 - :doc:`/administration/indexes`
 - :doc:`/applications/indexes`
 
-:wiki:`indexing <Indexes>` data in MongoDB.
-
 To continue learning about :doc:`application development
 </applications>` with MongoDB skim the :doc:`developer FAQs
 <faq/developers>` and consider the :doc:`use case documentation