[1.7.x] Fixed a typo in 1.6 release notes.
[1.7.x] Fixed a typo in 1.6 release notes.

Backport of 006451f894 from master

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