Rollup merge of #88292 - SkiFire13:enable-rustdoc-links, r=jyn514
Rollup merge of #88292 - SkiFire13:enable-rustdoc-links, r=jyn514

Enable --generate-link-to-definition for rustc's docs

cc `@jyn514`

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