[1.8.x] Fixed #24700 -- Added dash to slug regex in http docs
[1.8.x] Fixed #24700 -- Added dash to slug regex in http docs

Backport of 269a5dbdd37362e27b2bb3bf3a600ffd5ea2c3bb from master

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