Rollup merge of #106799 - scottmcm:remove-unused-generics, r=cuviper

Rollup merge of #106799 - scottmcm:remove-unused-generics, r=cuviper

Stop having unused lifetimes on some `impl`s

See <https://doc.rust-lang.org/nightly/std/cmp/trait.PartialOrd.html#impl-PartialOrd%3COsStr%3E-for-PathBuf>, where these lifetimes show up even though they're not needed:
![image](https://user-images.githubusercontent.com/18526288/212257802-da275167-38f9-4e2c-aafc-d44f0fc6a7c6.png)

With this PR, the unneeded lifetimes are no longer there:
![image](https://user-images.githubusercontent.com/18526288/212257938-0097c4bf-1247-4c91-8445-5bf0dde1b501.png)