[1.8.x] Clarified docstring in dispatch/dispatcher.py
[1.8.x] Clarified docstring in dispatch/dispatcher.py

Backport of 851f5bd413a93708436a129442007448755b34f3 from master

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