samples: Task ReadMe changes (#1420)

* Readme update

* fix queue name

Author: averikitsch

tasks/snippets/src/main/java/com/example/task/CreateHttpTaskWithToken.java

@@ -38,7 +38,7 @@ public static void main(String[] args) throws Exception {
     try (CloudTasksClient client = CloudTasksClient.create()) {
       // Variables provided by the system variables.
       // projectId = "my-project-id";
-      // queueName = "my-appengine-queue";
+      // queueName = "my-queue";
       // location = "us-central1";
       // url = "https://example.com/taskhandler";
       String payload = "hello";