[clang-tools-extra] [clang-doc] Test more language constructs (PR #205585)

[Paul Kirth via cfe-commits]

ilovepi wrote:

* **#205586** <a href="https://app.graphite.com/github/pr/llvm/llvm-project/205586?utm_source=stack-comment-icon" target="_blank"><img src="https://static.graphite.dev/graphite-32x32-black.png" alt="Graphite" width="10px" height="10px"/></a>
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* `main`


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https://github.com/llvm/llvm-project/pull/205585