[clang-tools-extra] [clang-doc] Add regression test for test comments in macros (PR #132510)

[Paul Kirth via cfe-commits]

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+// Fixes #59819. The underlying problem was fixed in https://reviews.llvm.org/D142560, but this patch adds a proper regression test.
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ilovepi wrote:

```suggestion
// Regression test for https://github.com/llvm/llvm-project/issues/59819

```

https://github.com/llvm/llvm-project/pull/132510