[1.8.x] Fixed #25125 -- Updated docs on cookie naming conventions.
[1.8.x] Fixed #25125 -- Updated docs on cookie naming conventions.

Thanks Tim Graham for the review and kezabelle for the report.

Backport of 2f6bdab1597ee42b36752bf9f624d3386e951379 from master

h4r5h1t/django-hauthy,h4r5h1t/django-hauthy,h4r5h1t/django-hauthy,h4r5h1t/django-hauthy