[1.7.x] Clarified custom header instructions in tutorial 2.
[1.7.x] Clarified custom header instructions in tutorial 2.

Backport of 0821b3d53ccd575de92ed679d173d779e1ad5acd from master

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