[clang] [analyzer] Add documentation for std::variant checker (PR #76501)

[Balazs Benics via cfe-commits]

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=?utf-8?q?G=C3=A1bor?= Spaits,Balazs Benics <benicsbalazs at gmail.com>
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https://github.com/steakhal approved this pull request.

LGTM now. Thanks.

https://github.com/llvm/llvm-project/pull/76501