Unclear installation instructions regarding Django's built-in Jinja template backend

[aleehedl]

I find the installation instructions regarding Django's built-in Jinja templating backend a bit unclear as to whether they are supported or not. There are mentions of the separate django-jinja and jingo projects with installation instructions but no mention of the built-in Jinja backend. If it's officially supported, then I guess adding something like this would make the instructions clearer:

With Django's built-in, add the extension to the extensions list:

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.jinja2.Jinja2',
        'OPTIONS': {
            'extensions': [
                # ...
                'waffle.jinja.WaffleExtension',
            ],
            # ...
        },
        # ...
    },
    # ...
]