[clang-tools-extra] [clang-doc] add tags to Mustache namespace template (PR #142045)

[via cfe-commits]

PeterChou1 wrote:

> > I cannibalized the tags from class-template.mustache. By happy accident, I realized that there is an `extractScopeChildren` so enums can be generated, which means the placeholders in `generateDocForInfo` (the `OS << "IT_enum\n"` part) can be filled in if the logic is moved to their own functions. In fact, they might not be needed since everything is scoped. 🤯
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> Well... that's a surprise.  It'd be really great to get @PeterChou1's take on all this, but we haven't heard from him in a couple months now.  
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> > I plan on adding things incrementally (global functions, etc) for the sake of smaller PRs.
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> Sounds good!
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Hi, sorry for the lack of response recently unfortunately my father passed away recently so I was dealing with the logistics. I'm more than happy to deal with any issues that arises from my previous code

https://github.com/llvm/llvm-project/pull/142045