assignment2 task 2 modified

Assignment2.md

@@ -123,8 +123,8 @@ $ docker ps -a
 
 CONTAINER ID 			IMAGE 					COMMAND 			CREATED 					STATUS
 305297d7a235 			busybox 				"uptime" 			11 minutes ago 		Exited (
-ff0a5c3750b9 			busybox 				"sh" 					12 minutes ago 		Exited (
-14e5bd11d164 			hello-world 		"/hello" 			2 minutes ago 		Exited (
+ff0a5c3750b9 			busybox 				"sh" 				12 minutes ago 		Exited (
+14e5bd11d164 			hello-world 			"/hello" 			2 minutes ago 		Exited (
 ```
 
 #### Wow~ 之前运行过的容器全部都出现在输出中了~