Update definition for "status message"

guidelines/sc/21/status-messages.html

@@ -1,9 +1,5 @@
 <section id="status-messages" class="sc">
-
    <h4>Status Messages</h4>
-
    <p class="conformance-level">AA</p>
-
-   <p>In content implemented using markup languages, <a>status messages</a> can be <a>programmatically determined</a> through <a>role</a> or properties such that they can be presented to the user by <a>assistive technologies</a> without receiving focus.</p>
-
+   <p><a>Status messages</a> that don't cause a <a>change of context</a> can be <a>programmatically determined</a> such that they can be presented to the user by <a>assistive technologies</a> without receiving focus.</p>
 </section>

guidelines/terms/21/status-message.html

@@ -1,6 +1,4 @@
 <dt><dfn id="dfn-status-messages" data-lt="status messages">status message</dfn></dt>
 <dd>
-
-   <p>change in content that is not a <a>change of context</a>, and that provides information to the user on the success or results of an action, on the waiting state of an application, on the progress of a <a>process</a>, or on the existence of errors</p>
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+   <p>discrete piece of content that is added or updated dynamically, and whose only purpose is to provide information to the user on the success or results of an action, on the waiting state of an application, on the progress or completion of a <a>process</a>, or on the existence of errors</p>
 </dd>