Updated queue.h docs for FetchAnother.

Change-Id: I34d0226af14e083c8a10cb020bfe8a93a8c4393b
diff --git a/aos/common/queue.h b/aos/common/queue.h
index 6cd699a..2098e66 100644
--- a/aos/common/queue.h
+++ b/aos/common/queue.h
@@ -191,8 +191,8 @@
   // fetched it.
   bool FetchLatest();
 
-  // Fetches another message from the queue. Blocks until there is one if the
-  // latest was already Fetched.
+  // Fetches the latest message from the queue, or blocks if we have already
+  // fetched it until another is avilable.
   void FetchAnother();
 
   // Returns the age of the message.