Made relative URLs clickable as well.

[alessandrosp]

Description

As of now, relative URLs are not clickable. This creates problems for some users who can't rely on the request's host to generate absolute URLs.

Very relevant:

#8460
https://stackoverflow.com/questions/64022460/drf-how-to-render-relative-urls-as-hyperlinks-in-the-browsable-api
https://stackoverflow.com/questions/71839932/django-rest-framework-how-to-make-relative-urls-clickable

Somehow relevant:

https://stackoverflow.com/questions/70092287/changing-url-path-of-api-in-django-rest-framework
https://stackoverflow.com/questions/62421753/how-to-change-the-host-in-next-key-in-a-paginated-url-in-django-rest-framework
https://stackoverflow.com/questions/34231393/how-to-change-the-django-rest-frameworks-default-url-to-a-custom

This change fixes this problem.

[tomchristie]

This looks like a reasonable fix to me, yup. Thanks.