Unnamed repository; edit this file 'description' to name the repository.
Rollup merge of #157535 - GuillaumeGomez:rename-err-to-diag-2, r=JonathanBrouwer
Rename `errors.rs` file to `diagnostics.rs` (2/N)
Follow-up of rust-lang/rust#157485.
r? @JonathanBrouwer
