[1.7.x] Fixed #23343 -- Typo in docs/ref/class-based-views/generic-date-based.txt.
[1.7.x] Fixed #23343 -- Typo in docs/ref/class-based-views/generic-date-based.txt.

Backport of 14aff0bd82 from master

jyotsna1820/django,oscaro/django,oscaro/django,jyotsna1820/django,jyotsna1820/django,oscaro/django,jyotsna1820/django,oscaro/django