Support Relative URLs

[mrwweb]

Thought this was a great idea posted in the support forums. Adding it here:

I would like to add a feature request on making the WP Help custom post type use relative links. That way it will be much easier to port the Help documentation of one site to another site.

I use a lot of links to admin pages in my site documentation and even when I add the link like for example /wp-admin/post-new.php?post_type=page, the export file still makes an absolute URL of it.

I have been looking through the code, but have not been able to make a filter like content_save_pre work.

I've run into this issue too, and this would be great.

[mrwweb]

cc: @senlin