[rustdoc] Please add support for `Self` in inter-method docs links

[Lokathor]

Currently if you have a link in a method's docs to another method on the same type you have to put it as

[`read`](RwVolAddr::read)

It would be helpful if Self was recognized when linking to other methods of the same type.

[`read`](Self::read)

This should be closed, because it looks like duplicate of
#70802
which got resolved by
#71289