Translate doc link to intra-doc-link, fix broken links

[scrabsha]

Transitioning to intra-doc-link will allow us to get better feedback about broken links in the future. It also allows us to remove some annotations that are guessed by rustdoc.

This PR should translate every link to intra-doc-link.

Fix #280.

Checklist

• [x] tests are passing with cargo test.
• [x] tests and/or benchmarks are included
• [x] documentation is changed or added
• [x] commit message is clear