Added type to closure. (#7856)

Author: ash-jc-allen

http-client.md

@@ -382,7 +382,9 @@ If you would like to fake a sequence of responses but do not need to specify a s
 
 If you require more complicated logic to determine what responses to return for certain endpoints, you may pass a closure to the `fake` method. This closure will receive an instance of `Illuminate\Http\Client\Request` and should return a response instance. Within your closure, you may perform whatever logic is necessary to determine what type of response to return:
 
-    Http::fake(function ($request) {
+    use Illuminate\Http\Client\Request;
+
+    Http::fake(function (Request $request) {
         return Http::response('Hello World', 200);
     });