Minor suggestion to documentation

[jillson]

Using Django 1.10, it appears the {% load url from future %} in the examples is both unnecessary and now not supported. (Actually, per https://stackoverflow.com/questions/5653497/django-load-url-from-future-yields-error-url-is-not-a-valid-tag-libra it looks like 1.9 is when this was removed)

(Also: thanks for saving me from having to do this by hand for the Nth time for my next Django project)