message: Add link to pr for documentation
diff: @@ -42,5 +42,6 @@ rustc_version = "0.2.3"
  colored = "2"
  [package.metadata.rust-analyzer]
  -# This crate uses #[feature(rustc_private)]
  +# This crate uses #[feature(rustc_private)].
  +# See https://github.com/rust-analyzer/rust-analyzer/pull/7891
  rustc_private = true
  