Fixed #8539: fixed PEP references. Thanks, carljm.

Please follow these coding standards when writing code for inclusion in Django:

    * Unless otherwise specified, follow :pep:8.

    * Unless otherwise specified, follow :pep:`8`.

      You could use a tool like `pep8.py`_ to check for some problems in this

      area, but remember that PEP 8 is only a guide, so respect the style of

:class:`connection <django.db.backends.DatabaseWrapper>` and

:class:`<django.db.backends.CursorWrapper>` mostly implement the standard Python

DB-API -- see :pep:249 -- with the addition of Django's :ref:`transaction

DB-API -- see :pep:`249` -- with the addition of Django's :ref:`transaction

handling <topics-db-transactions>`. If you're not familiar with the Python

DB-API, note that the SQL statement in :meth:`cursor.execute()

<django.db.backends.CursorWrapper.execute>` uses placeholders, ``"%s"``, rather