[clang-tools-extra] readability-identifier-naming should add universal default options (PR #171686)

[Victor Chernyakin via cfe-commits]

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@@ -223,6 +255,31 @@ Options description
 
 A detailed description of each option is presented below:
 
+.. option:: DefaultCase
+
+    When defined, the check will ensure all names by default conform to the
+    selected casing.
+
+.. option:: DefaultPrefix
+
+    When defined, the check will ensure all names by default will add the
+    prefixed with the given value (regardless of casing).
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localspook wrote:

I'd be okay with leaving it to be fixed along with the existing cases in a future PR; up to you

https://github.com/llvm/llvm-project/pull/171686