It seems to suggest that the documentation property is able to accept a title parameter, to change the text of the link itself. Using the example given in the page, I’ve tested this:
I suspect the title field should result in a title="Go Somewhere" attribute in the link, but it is not clear from the documentation and I don’t think this actually happens. It’s not clear to me what the altText field is for.
Further, if you specify a custom editor rather than macro parameters, the documentation link disappears.