cleanup code comments.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2044 bbd45198-f89e-11dd-88c7-29a3b14d5316

src/idle.c

@@ -169,7 +169,7 @@ static void rt_thread_idle_entry(void *parameter)
  */
 void rt_thread_idle_init(void)
 {
-	/* init thread */
+	/* initialize thread */
 	rt_thread_init(&idle,
 		"tidle",
 		rt_thread_idle_entry, RT_NULL,