dfn fixes

Author: hoch

index.bs

@@ -11866,10 +11866,9 @@ thread</a> is done using <a>control message</a> passing.
 Communication in the other direction is done using regular event loop
 tasks.
 
-Each {{AudioContext}} has a single <dfn>control message
-queue</dfn> that is a list of <dfn lt="control message">control
-messages</dfn> that are operations running on the <a>rendering
-thread</a>.
+Each {{AudioContext}} has a single <dfn>control message queue</dfn> 
+that is a list of <dfn lt="control message">control messages</dfn> that are
+operations running on the <a>rendering thread</a>.
 
 <dfn id="queuing" lt="queue a control message">Queuing a control message</dfn>
 means adding the message to the end of the <a>control message queue</a> of an