[v3, assetServer] Update docs

mkdocs-website/docs/en/API/fullapi.md

@@ -1205,31 +1205,21 @@ AssetOptions defines the configuration of the AssetServer.
 
 ```go
 type AssetOptions struct {
-    // FS defines the static assets to be used. A GET request is first tried to be served from this FS. If the FS returns
-    // `os.ErrNotExist` for that file, the request handling will fallback to the Handler and tries to serve the GET
-    // request from it.
-    //
-    // If set to nil, all GET requests will be forwarded to Handler.
-    FS  fs.FS
+    // Handler which serves all the content to the WebView.
+	Handler http.Handler
 
-    // Handler will be called for every GET request that can't be served from FS, due to `os.ErrNotExist`. Furthermore all
-    // non GET requests will always be served from this Handler.
-    //
-    // If not defined, the result is the following in cases where the Handler would have been called:
-    //   GET request:   `http.StatusNotFound`
-    //   Other request: `http.StatusMethodNotAllowed`
-    Handler http.Handler
-
-    // Middleware is HTTP Middleware which allows to hook into the AssetServer request chain. It allows to skip the default
-    // request handler dynamically, e.g. implement specialized Routing etc.
-    // The Middleware is called to build a new `http.Handler` used by the AssetSever and it also receives the default
-    // handler used by the AssetServer as an argument.
-    //
-    // If not defined, the default AssetServer request chain is executed.
-    //
-    // Multiple Middlewares can be chained together with:
-    //   ChainMiddleware(middleware ...Middleware) Middleware
-    Middleware Middleware
+	// Middleware is a HTTP Middleware which allows to hook into the AssetServer request chain. It allows to skip the default
+	// request handler dynamically, e.g. implement specialized Routing etc.
+	// The Middleware is called to build a new `http.Handler` used by the AssetSever and it also receives the default
+	// handler used by the AssetServer as an argument.
+	//
+	// This middleware injects itself before any of Wails internal middlewares.
+	//
+	// If not defined, the default AssetServer request chain is executed.
+	//
+	// Multiple Middlewares can be chained together with:
+	//   ChainMiddleware(middleware ...Middleware) Middleware
+	Middleware Middleware
 
     // External URL can be set to a development server URL so that all requests are forwarded to it. This is useful
     // when using a development server like `vite` or `snowpack` which serves the assets on a different port.