Fixed #19555 - Removed '2012' from tutorial 1.

    >>> Poll.objects.filter(question__startswith='What')

    [<Poll: What's up?>]

    # Get the poll whose year is 2012.

    >>> Poll.objects.get(pub_date__year=2012)

    # Get the poll that was published this year.

    >>> from django.utils import timezone

    >>> current_year = timezone.now().year

    >>> Poll.objects.get(pub_date__year=current_year)

    <Poll: What's up?>

    # Request an ID that doesn't exist, this will raise an exception.

    # The API automatically follows relationships as far as you need.

    # Use double underscores to separate relationships.

    # This works as many levels deep as you want; there's no limit.

    # Find all Choices for any poll whose pub_date is in 2012.

    >>> Choice.objects.filter(poll__pub_date__year=2012)

    # Find all Choices for any poll whose pub_date is in this year

    # (reusing the 'current_year' variable we created above).

    >>> Choice.objects.filter(poll__pub_date__year=current_year)

    [<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]

    # Let's delete one of the choices. Use delete() for that.