[1.5.x] Fixed #20614 -- Typo in documentation.
[1.5.x] Fixed #20614 -- Typo in documentation.

Backport of 39b245fd76 from master

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