docs: add Rust logo to more compiler crates

c6e6ecb1af added it to some of the
compiler's crates, but avoided adding it to all of them to reduce
bit-rot. This commit adds to more.

compiler/rustc_error_messages/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(not(bootstrap), doc(rust_logo))]
+#![cfg_attr(not(bootstrap), feature(rustdoc_internals))]
 #![feature(let_chains)]
 #![feature(lazy_cell)]
 #![feature(rustc_attrs)]