[1.5.X] Fixed typo in docs/topics/class-based-views/generic-display.txt
[1.5.X] Fixed typo in docs/topics/class-based-views/generic-display.txt

Backport of 22d5e4b4af from master

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