[clang-tools-extra] [clang-tidy] add fixhint for misc-use-internal-linkage (PR #96203)

[Congcong Cai via cfe-commits]

================
@@ -25,3 +25,16 @@ Example:
   }
   // already declared as extern
   extern int v2;
+
+Options
+-------
+
+.. option:: FixMode
----------------
HerrCai0907 wrote:

#96779 

https://github.com/llvm/llvm-project/pull/96203