Remove duplicate sphinx labels in release notes

docs/source/releases/v0.7.rst

 
 Welcome to Oscar 0.7!
 
-These release notes cover the :ref:`new features <what_is_new>` as well as
-:ref:`backwards incompatible changes <incompatible_changes>` that you'll want to be aware of when
+These release notes cover the :ref:`new features <new_in_0.7>` as well as
+:ref:`backwards incompatible changes <incompatible_changes_in_0.7>` that you'll want to be aware of when
 upgrading from Oscar 0.6 or earlier.  
 
 If you encounter any undocumented issues, please let us know on the `mailing
     :local:
     :depth: 1
 
-.. _overview:
+.. _overview_of_0.7:
 
 Overview
 ========
 as the core Oscar checkout view classes have been reorganised slightly.  Any
 upgrading work should be minor but be diligent.
 
-.. _compatibility:
+.. _compatibility_of_0.7:
 
 Compatibility
 =============
 Support for Django 1.4 has been dropped, and support for Django 1.6 is
 now considered stable.
 
-.. _what_is_new:
+.. _new_in_0.7:
 
 What's new in Oscar 0.7?
 ========================
 If you want to pass a billing address to be saved against the order, then pass
 it as part of the ``order_kwargs`` option.
 
-.. _minor_changes:
+.. _minor_changes_in_0.7:
 
 Minor changes
 ~~~~~~~~~~~~~
 .. _`#1289`: https://github.com/tangentlabs/django-oscar/issues/1289
 .. _`be04d46639`: https://github.com/tangentlabs/django-oscar/commit/
 
-.. _incompatible_changes:
+.. _incompatible_changes_in_0.7:
 
 Backwards incompatible changes in 0.7
 =====================================

docs/source/releases/v0.8.rst

     :local:
     :depth: 1
 
-.. _overview:
+.. _overview_of_0.8:
 
 Overview
 ========
 
 Oscar now has a demo site customised for the US!
 
-.. _compatibility:
+.. _compatibility_of_0.8:
 
 Compatibility
 =============
 Support for Python 2.6 has been dropped; Oscar works with Python 2.7, 3.3
 and 3.4.
 
-.. _what_is_new:
+.. _new_in_0.8:
 
 What's new in Oscar 0.8?
 ========================
 
 See :ref:`us_site` for more information.
 
-.. _minor_changes:
+.. _minor_changes_in_0.8:
 
 Minor changes
 -------------
 Bugfixes
 ~~~~~~~~
 
-.. _backwards_incompatible_changes:
+.. _incompatible_changes_in_0.8:
 
 Backwards incompatible changes in 0.8
 =====================================
 
 .. _removal_of_deprecated_features:
 
-Removal of features deprecated in 0.8
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 Migrations
 ~~~~~~~~~~