[clang] [clang] Add -Wmissing-designated-field-initializers (PR #81364)

[Aaron Ballman via cfe-commits]

================
@@ -148,6 +148,10 @@ Non-comprehensive list of changes in this release
 New Compiler Flags
 ------------------
 
+- ``-Wmissing-designated-field-initializers``, grouped under ``-Wmissing-designated-field-initializers``.
+  This diagnostic can be disabled to make ``-Wmissing-designated-field-initializers`` behave
----------------
AaronBallman wrote:

```suggestion
  This diagnostic can be disabled to make ``-Wmissing-field-initializers`` behave
```

https://github.com/llvm/llvm-project/pull/81364