Always display stability version even if it's the same as the containing item Fixes https://github.com/rust-lang/rust/issues/118439. Currently, if the containing item's version is the same as the item's version (like a method), we don't display it on the item. This was something done on purpose as you can see [here](https://github.com/rust-lang/rust/blob/e9b7bf011478aa8c19ac49afc99853a66ba04319/src/librustdoc/html/render/mod.rs#L949-L955). It was implemented in https://github.com/rust-lang/rust/pull/30686. I think we should change this because on pages with a lot of items, if someone arrives (through the search or a link) to an item far below the page, they won't know the stability version unless they scroll to the top, which isn't great. You can see the result [here](https://rustdoc.crud.net/imperio/display-stability-version/std/pin/struct.Pin.html#method.new). r? `@notriddle`