Rollup merge of #120641 - klensy:copypaste-me, r=notriddle

rustdoc: trait.impl, type.impl: sort impls to make it not depend on serialization order

Can be tested by running `cargo doc` with different rust versions on some crate and comparing `doc` folders: files in `trait.impl` and `type.impl` will sometimes have different order of impls.

Author: matthiaskrgr