Use consistent file casing for Razor Sdk

src/Microsoft.NET.Sdk.Razor/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets

@@ -1,6 +1,6 @@
 <!--
 ***********************************************************************************************
-Microsoft.Net.Sdk.Razor.Compilation.targets
+Microsoft.NET.Sdk.Razor.Compilation.targets
 
 WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and have
           created a backup copy.  Incorrect changes to this file will make it

src/Microsoft.NET.Sdk.Razor/build/netstandard2.0/Microsoft.NET.Sdk.Razor.targets

@@ -1,6 +1,6 @@
 <!--
 ***********************************************************************************************
-Microsoft.Net.Sdk.Razor.targets
+Microsoft.NET.Sdk.Razor.targets
 
 WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and have
           created a backup copy.  Incorrect changes to this file will make it

src/Microsoft.NET.Sdk.Razor/build/netstandard2.0/Sdk.Razor.CurrentVersion.targets

@@ -147,7 +147,7 @@ Copyright (c) .NET Foundation. All rights reserved.
 
     RazorCoreCompile should be defined there.
   -->
-  <Import Project="Microsoft.Net.Sdk.Razor.Compilation.targets" />
+  <Import Project="Microsoft.NET.Sdk.Razor.Compilation.targets" />
 
   <Target Name="PrepareForRazorGenerate" DependsOnTargets="$(PrepareForRazorGenerateDependsOn)">
   </Target>