Check rust lints when an unknown lint is detected

[alice-i-cecile]

Code

[lints.clippy]
missing_docs = "warn"

In your Cargo.toml.

Current output

warning[E0602]: unknown lint: `clippy::missing_docs`
  |
  = help: did you mean: `clippy::erasing_op`
  = note: requested on the command line with `-W clippy::missing_docs`
  = note: `#[warn(unknown_lints)]` on by default

Desired output

warning[E0602]: unknown lint: `clippy::missing_docs`
  |
  = help: did you mean: `missing_docs`. A lint with the same name was found in `rustc` lints.
  = note: requested on the command line with `-W clippy::missing_docs`
  = note: `#[warn(unknown_lints)]` on by default

Rationale and extra context

Initially opened at rust-lang/rust-clippy#11855