Address code review feedback

build/TargetFramework.props

@@ -1,7 +1,9 @@
 <Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
       <CliTargetFramework>netcoreapp3.0</CliTargetFramework>
-      <!-- We only need this until we get a stage0 with a 3.0 SDK. -->
+      
+      <!-- Workaround until the stage0 SDK supports .NET Core 3.0.
+           It won't hurt anything to leave this in though. -->
       <NETCoreAppMaximumVersion>3.0</NETCoreAppMaximumVersion>
   </PropertyGroup>
 </Project>

test/EndToEnd/GivenDotNetUsesMSBuild.cs

@@ -30,6 +30,7 @@ namespace Microsoft.DotNet.Tests.EndToEnd
                 string projectPath = Directory.GetFiles(projectDirectory, "*.csproj").Single();
 
                 //  Override TargetFramework since there aren't .NET Core 3 templates yet
+                //  https://github.com/dotnet/core-sdk/issues/24 tracks removing this workaround
                 XDocument project = XDocument.Load(projectPath);
                 var ns = project.Root.Name.Namespace;
                 project.Root.Element(ns + "PropertyGroup")