Fixed #8603: Corrected typo in cross-reference to PDF-generation docs

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8735 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/index.txt

@@ -126,7 +126,7 @@ Solving specific problems
 :ref:`Custom template tags <howto-custom-template-tags>`
     Add your own extensions to Django's template language.
     
-:ref:`Generating CSV <howto-outputting-csv>` & :ref:`PDF <howto-outputting-PDF>`
+:ref:`Generating CSV <howto-outputting-csv>` & :ref:`PDF <howto-outputting-pdf>`
     Produce non-HTML content with Django.
     
 And more: