Rollup merge of #125382 - notriddle:notriddle/issue-d, r=fmease

rustdoc: rename `issue-\d+.rs` tests to have meaningful names (part 7)

Follow up

* rust-lang/rust#116214
* rust-lang/rust#116432
* rust-lang/rust#116824
* rust-lang/rust#118105
* rust-lang/rust#119561
* rust-lang/rust#123574

As always, it's easier to review the commits one at a time. Don't use the Files Changed tab. It's confusing.