[1.5.X] Fixed #19717 - Removed mentions of "root QuerySet" in docs.
[1.5.X] Fixed #19717 - Removed mentions of "root QuerySet" in docs.

Thanks julien.aubert.mail@ for the report and James Pic for the patch.

Backport of 64d0f89ab1 from master

bliti/django-nonrel-1.5,bliti/django-nonrel-1.5,alx-eu/django,hasadna/django,ccn-2m/django,alx-eu/django,ccn-2m/django,ccn-2m/django,imtapps/django-imt-fork,hasadna/django,imtapps/django-imt-fork,imtapps/django-imt-fork,alx-eu/django,bliti/django-nonrel-1.5,hasadna/django,alx-eu/django,ccn-2m/django