[1.7.x] Fixed typos of "select_related" in docs.

The order of ``filter()`` and ``select_related()`` chaining isn't important.

These querysets are equivalent::

    Entry.objects.filter(pub_date__gt=timezone.now()).selected_related('blog')

    Entry.objects.selected_related('blog').filter(pub_date__gt=timezone.now())

    Entry.objects.filter(pub_date__gt=timezone.now()).select_related('blog')

    Entry.objects.select_related('blog').filter(pub_date__gt=timezone.now())

You can follow foreign keys in a similar way to querying them. If you have the

following models::