xdg-su: fix some trivial documentation TODOs

Submitted by Reuben Thomas

Assigned to Portland Bugs

Link to original bug (#98497)

Description

Created attachment 127613 Fix a couple of documentation TODOs for xdg-su

I'm aware that xdg-su is not currently shipped, but noticed some trivially-fixable TODOs in the TODO file, so fixed them. This should avoid people like me wondering what those TODOs are about in future, and seemed better than merely removing them!

Patch 127613, "Fix a couple of documentation TODOs for xdg-su":
0002-xdg-su-fix-some-easy-TODOs.patch