Fix documentation: COMMENT_APP setting'srequired
Fix documentation: COMMENT_APP setting'srequired

jayfk/django-comments-xtd,jayfk/django-comments-xtd,agilosoftware/django-comments-xtd,danirus/django-comments-xtd,danirus/django-comments-xtd,danirus/django-comments-xtd,agilosoftware/django-comments-xtd,agilosoftware/django-comments-xtd,danirus/django-comments-xtd