I was advised by someone in chat that you would be good to speak to regarding something, I found on the page: Self Heal champion. It is stated on the page that:
"This category lists champions who have some form of self healing ability, but are incapable of healing allies, which belongs in the healers category"
As far as I am aware Kayle is capable of healing alies and is also listed in the category: Healer champion and no other champions such as Nidalee who have a heal similar to Kayle's appear on both pages.
Sorry if am mistaken or posting in the wrong place im noob here :3