Removed extra period.
Explained why admindocs omits model methods with arguments.
Fixed #23734 -- Replaced striptags in template filter overview since it has security implications.

Thanks Aymeric Augustin for the suggestion.
Fixed #23737 -- Recommended the render() shortcut more strongly.

Thanks Aymeric Augustin for the report.
Fixed #23736 -- Corrected the description of the value that silent_variable_failure uses.

Thanks Aymeric Augustin for the report.
Fixed #23735 -- Clarified that admindocs must be enabled to view template tag libraries in admin.

Thanks Aymeric Augustin for the report.
Fixed #23656 -- Made FormMixin.get_form's form_class argument optional.

Thanks Tim Graham for the review.
Fixed #23468 -- settings.FIXTURE_DIRS checks in loaddata command

If settings.FIXTURE_DIRS contains duplicates or default fixture
directory (app_name/fixtures), ImproperlyConfigured is raised