Update migration guide for ABP 10.0

Added instructions for using Razor Runtime Compilation.

docs/en/release-info/migration-guides/abp-10-0.md

@@ -21,6 +21,10 @@ We removed the Razor Runtime Compilation support since it is obsolete and replac
 If you want to keep using it, you can add [Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation](https://www.nuget.org/packages/Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation) package to your project and configure it manually.
 
 ```csharp
+using Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation;
+using Volo.Abp.DependencyInjection;
+using Volo.Abp.AspNetCore.VirtualFileSystem;
+
 public override void ConfigureServices(ServiceConfigurationContext context)
 {
     if (context.Services.GetHostingEnvironment().IsDevelopment())