[1.5.x] Fixed #20385 -- Typo in files docs.
[1.5.x] Fixed #20385 -- Typo in files docs.

Backport of bdd2857 from master.

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