Fixed up comment header block

DirectXTex/Shaders/BC6HEncode.hlsl

@@ -4,6 +4,7 @@
 // The Compute Shader for BC6H Encoder
 //
 // Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
 //--------------------------------------------------------------------------------------
 
 #define REF_DEVICE

DirectXTex/Shaders/BC7Encode.hlsl

@@ -4,6 +4,7 @@
 // The Compute Shader for BC7 Encoder
 //
 // Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
 //--------------------------------------------------------------------------------------
 
 //#define REF_DEVICE

DirectXTex/Shaders/CompileShaders.cmd

@@ -1,10 +1,6 @@
 @echo off
-rem THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
-rem ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
-rem THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
-rem PARTICULAR PURPOSE.
-rem
 rem Copyright (c) Microsoft Corporation. All rights reserved.
+rem Licensed under the MIT License.
 
 setlocal
 set error=0