Fixed #9301 -- Correct a markup typo in the docs.

Once you've created your :ref:`data models <topics-db-models>`, Django

automatically gives you a database-abstraction API that lets you create,

retrieve, update and delete objects. This document explains how to use this 

API. Refer to the `data model reference <ref-models-index>` for full 

API. Refer to the :ref:`data model reference <ref-models-index>` for full 

details of all the various model lookup options.

Throughout this guide (and in the reference), we'll refer to the following