Allow GraphQL in docs without backticks

[Kestrer]

changelog: Allow "GraphQL" in [doc_markdown] without backticks.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @ebroto (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 Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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.

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[ebroto]

We should add a test in tests/ui/doc.rs, you can take a look at #3533 for an example.

[ebroto]

@bors r+

Thanks, and feel free to take another issue if you wish, we have plenty of them :)

[bors]

📌 Commit 22c9940 has been approved by ebroto

[bors]

⌛ Testing commit 22c9940 with merge 7f27b12...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: ebroto
Pushing 7f27b12 to master...