docs: Fix external references to point to Django stable
docs: Fix external references to point to Django stable

sriram1991/django-contrib-comments,dzhuang/django-contrib-comments,collinanderson/django-contrib-comments,anistark/django-contrib-comments,Maplecroft/django-contrib-comments,Maplecroft/django-contrib-comments,gushedaoren/django-contrib-comments,mgpyh/django-contrib-comments,radiantflow/django-comments,dzhuang/django-contrib-comments,kinsights/django-contrib-comments,kinsights/django-contrib-comments,eXcomm/django-contrib-comments,gushedaoren/django-contrib-comments,sriram1991/django-contrib-comments,petersanchez/django-contrib-comments,mgpyh/django-contrib-comments,radiantflow/django-comments,giginet/django-contrib-comments,anistark/django-contrib-comments,eXcomm/django-contrib-comments,petersanchez/django-contrib-comments,collinanderson/django-contrib-comments,giginet/django-contrib-comments,django/django-contrib-comments,django/django-contrib-comments