Ref style link false positive

[nahuakang]

This PR does not fix #5834, but it records the problematic link text as a known problem inside doc_markdown lint.

r? @flip1995

• Followed [lint naming conventions][lint_naming]
• Added passing UI tests (including committed .stderr file)
• cargo test passes locally
• Executed cargo dev update_lints
• Added lint documentation
• Run cargo dev fmt

---

Please keep the line below
changelog: Document problematic link text style as known problem for doc_markdown

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @matthiaskrgr (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

[flip1995]

r? @flip1995

Thanks for the contribution and welcome to Clippy!

This is ready to get merged, after you squash the commits. See this blog post on how to do it: https://www.internalpointers.com/post/squash-commits-into-one-git

[flip1995]

Thanks! (Sorry for taking so long to approve. I hate that GitHub sometimes does not show notifications for force pushes... Not your fault though)

@bors r+

[bors]

📌 Commit f302af3 has been approved by flip1995

[bors]

⌛ Testing commit f302af3 with merge 8b70b84...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: flip1995
Pushing 8b70b84 to master...