[clang] [clang] Mark CWG2708, CWG2713, CWG2792 as resolved; sync CWG2947 status (PR #191174)

[Vlad Serebrennikov via cfe-commits]

================
@@ -58,6 +58,25 @@ A b = {3, 4, 5};
 
 } // namespace cwg2707
 
+namespace cwg2708 { // cwg2708: yes
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Endilll wrote:

```suggestion
namespace cwg2708 { // cwg2708: 16
```

https://github.com/llvm/llvm-project/pull/191174