[clang-tools-extra] [clang-tidy] Skip `decltype(auto)` variables in misc-const-correctness (PR #224465)

[Yanzuo Liu via cfe-commits]

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@@ -60,6 +60,9 @@ Limitations
 
 The check does not run on `C` code.
 
+Variables declared with ``decltype(auto)`` are not analyzed, because
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zwuis wrote:

You put this in the _Limitations_ section. Did you mean we can handle it theoretically but we don't do it currently?

https://github.com/llvm/llvm-project/pull/224465