[1.7.x] Fixed formatting in docs/ref/templates/builtins.txt
[1.7.x] Fixed formatting in docs/ref/templates/builtins.txt

Backport of 6023312dde022d31d44373e8834431456095dc7c from master

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