Update virtual file system document.

docs/en/Virtual-File-System.md

@@ -44,7 +44,7 @@ If you want to add multiple files, this can be tedious. Alternatively, you can d
 
 This configuration recursively adds all files under the **MyResources** folder of the project (including the files you will add in the future).
 
-Then the module needs to be configured using `VirtualFileSystemOptions` to register the embedded files to the virtual file system. Example:
+Then the module needs to be configured using `AbpVirtualFileSystemOptions` to register the embedded files to the virtual file system. Example:
 
 ````C#
 using Microsoft.Extensions.DependencyInjection;
@@ -58,10 +58,10 @@ namespace MyCompany.MyProject
     {
         public override void ConfigureServices(ServiceConfigurationContext context)
         {
-            Configure<VirtualFileSystemOptions>(options =>
+            Configure<AbpVirtualFileSystemOptions>(options =>
             {
                 //Register all embedded files of this assembly to the virtual file system
-                options.FileSets.AddEmbedded<MyModule>();
+                options.FileSets.AddEmbedded<MyModule>("YourRootNameSpace");
             });
 
             //...
@@ -73,9 +73,12 @@ namespace MyCompany.MyProject
 The `AddEmbedded` extension method takes a class, finds all embedded files from the assembly of the given class and registers them to the virtual file system. More concisely it could be written as follows:
 
 ````C#
-options.FileSets.Add(new EmbeddedFileSet(typeof(MyModule).Assembly));
+options.FileSets.Add(
+    new EmbeddedFileSet(typeof(MyModule).Assembly), "YourRootNameSpace");
 ````
 
+> "YourRootNameSpace" is the root namespace of your project. It can be empty if your root namespace is empty.
+
 #### Getting Virtual Files: IVirtualFileProvider
 
 After embedding a file into an assembly and registering it to the virtual file system, the `IVirtualFileProvider` interface can be used to get files or directory contents:
@@ -122,7 +125,7 @@ public class MyWebAppModule : AbpModule
 
         if (hostingEnvironment.IsDevelopment()) //only for development time
         {
-            Configure<VirtualFileSystemOptions>(options =>
+            Configure<AbpVirtualFileSystemOptions>(options =>
             {
                 //ReplaceEmbeddedByPhysical gets the root folder of the MyModule project
                 options.FileSets.ReplaceEmbeddedByPhysical<MyModule>(