Rollup merge of rust-lang#103952 - ehuss:dont-intra-linkcheck-reference, r=Mark-Simulacrum

Don't intra linkcheck reference

This removes the reference from the intra-doc link checks. This causes problems if any of the reference content needs to change, it causes the linkchecker to break. The reference has its own broken link check (https://github.com/rust-lang/reference/tree/master/style-check) which uses pulldown-cmark on the source to find actual broken links (instead of false-positives like this regex does).

I think the intra-doc link check could potentially be removed completely, since I think rustdoc is now checking for them well enough. However, it may serve as a decent regression check.

Author: Dylan-DPC