Per P0 reqs add launch pts + make download obvious. Also misc cpy edits.

native_client_sdk/doc_generated/devguide/coding/message-system.html

 {{+bindTo:partials.standard_nacl_article}}
 
 <section id="messaging-system">
 <span id="message-system"></span><h1 id="messaging-system"><span id="message-system"></span>Messaging System</h1>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#reference-information" id="id2">Reference information</a></li>
 <li><p class="first"><a class="reference internal" href="#introduction-to-the-messaging-system" id="id3">Introduction to the messaging system</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#design-of-the-messaging-system" id="id4">Design of the messaging system</a></li>
@@ skipping 13 matching lines @@
 <li><p class="first"><a class="reference internal" href="#messaging-in-the-native-client-module-more-details" id="id10">Messaging in the Native Client module: More details.</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#implementing-handlemessage" id="id11">Implementing HandleMessage()</a></li>
 <li><a class="reference internal" href="#implementing-application-specific-functions" id="id12">Implementing application-specific functions</a></li>
 <li><a class="reference internal" href="#sending-messages-back-to-the-javascript-code" id="id13">Sending messages back to the JavaScript code</a></li>
 <li><a class="reference internal" href="#sending-and-receiving-other-pp-var-types" id="id14">Sending and receiving other <code>pp::Var</code> types</a></li>
 </ul>
 </li>
 </ul>
 
-</div><p>This chapter describes the messaging system used to communicate between the
+</div><p>This section describes the messaging system used to communicate between the
 JavaScript code and the Native Client module&#8217;s C or C++ code in a
 Native Client application. It introduces the concept of asynchronous
 programming and the basic steps required to set up a Native Client module
-that sends messages to and receive messages from JavaScript. This chapter
+that sends messages to and receive messages from JavaScript. This section
 assumes you are familiar with the material presented in the
-<a class="reference internal" href="/native-client/devguide/coding/application-structure.html"><em>Application Structure</em></a> chapter.</p>
+<a class="reference internal" href="/native-client/devguide/coding/application-structure.html"><em>Application Structure</em></a> section.</p>
 <aside class="note">
 The &#8220;Hello, World&#8221; example for getting started with NaCl is used here to
 illustrate basic programming techniques. You can find this code in
 the <code>/getting_started/part2</code> directory in the Native Client SDK download.
 </aside>
 <h2 id="reference-information">Reference information</h2>
 <p>For reference information related to the Pepper messaging API, see the
 following documentation:</p>
 <ul class="small-gap">
 <li><a class="reference external" href="/native-client/pepper_stable/cpp/classpp_1_1_instance">pp::Instance class</a>
@@ skipping 297 matching lines @@
     pp::VarArray keys = dictionary.GetKeys();
     // ...
   } else {
     // ...
   }
 }
 </pre>
 </section>
 
 {{/partials.standard_nacl_article}}