Doc markdown

[kawogi]

I added "WebGL" along the lines of the existing "OpenGL" to the whitelist of doc_markdown as I found this to be a pretty common term.

(this is a follow-up of the now closed #6388)

changelog: Whitelist "WebGL" in 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 @llogiq (or someone else) soon.

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[llogiq]

Thank you!

@bors r+

[bors]

📌 Commit c3244c2 has been approved by llogiq

[bors]

⌛ Testing commit c3244c2 with merge 4d381c3...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: llogiq
Pushing 4d381c3 to master...