Update ItaniumDemangle.h

Author: c8ef

libcxxabi/src/demangle/ItaniumDemangle.h

@@ -1,5 +1,5 @@
-//===--- ItaniumDemangle.h -----------*- mode:c++;eval:(read-only-mode) -*-===//
-//       Do not edit! See README.txt.
+//===------------------------- ItaniumDemangle.h ----------------*- C++ -*-===//
+//
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception