Clarification for issue 75

Author: sujithhanwha

doc/Media2.xml

@@ -3106,11 +3106,11 @@ Topics: tns1:Monitoring/ActiveSessions/VideoEncoder
       </section>
  <section xml:id="_evtMAD">
   <title>MulticastAudioDecoder State</title>
-  <para>Whenever a multicast audio decoder starts or stops receiving an audio stream, the following event should be generated.</para>
+  <para>Whenever a multicast audio decoder starts or stops receiving an audio stream, the following event shall be generated.</para>
   <para>The <code>ConfigurationToken</code> refers to the multicast audio decoder configuration
           token. If none of the multicast audio decoder configurations are active at any point, the
-            <code>ConfigurationToken</code> field can be left empty, and the <code>Active</code>
-          field can be set to false.</para>
+            <code>ConfigurationToken</code> field may be left empty, and the <code>Active</code>
+          field shall be set to false.</para>
   <programlisting><![CDATA[
     Topic: tns1:Media/MulticastAudioDecoder/State