Fix nuget.config

Author: wtgodbe

NuGet.config

@@ -9,8 +9,6 @@
     <!--  Begin: Package sources from dotnet-efcore -->
     <add key="darc-int-dotnet-efcore-645f313" value="https://pkgs.dev.azure.com/dnceng/internal/_packaging/darc-int-dotnet-efcore-645f3131/nuget/v3/index.json" />
     <!--  End: Package sources from dotnet-efcore -->
-    <!--  Begin: Package sources from dotnet-runtime -->
-    <!--  End: Package sources from dotnet-runtime -->
     <!--End: Package sources managed by Dependency Flow automation. Do not edit the sources above.-->
     <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" />
     <add key="dotnet-tools" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json" />