Rollup merge of #84469 - jyn514:dead-code, r=Mark-Simulacrum
Rollup merge of #84469 - jyn514:dead-code, r=Mark-Simulacrum

Update comment on `PrimTy::name_str`

It's no longer used by rustdoc.

aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust