fixes includes and license

Author: elstehle

libcudacxx/include/cuda/discard_memory

@@ -1,139 +1,18 @@
-/*
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+//===----------------------------------------------------------------------===//
+//
+// Part of libcu++, the C++ Standard Library for your entire system,
+// 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
+// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
+//
+//===----------------------------------------------------------------------===//
 
 #ifndef _CUDA_DISCARD_MEMORY
 #define _CUDA_DISCARD_MEMORY
 
 #include <cuda/std/cstdint>
-#include "std/detail/__config"
+#include <cuda/std/detail/__config>
 
 _LIBCUDACXX_BEGIN_NAMESPACE_CUDA