NaCl docs: a few improvements

native_client_sdk/src/doc/index.rst

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 Welcome to Native Client
 ########################
 
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   <div id="home">
   <div class="pull-quote">To get the SDK and<br/>installation instructions<br/>
   <a href="/native-client/sdk/download.html">visit the SDK Download page</a>.
   </div>
   <div class="big-intro">
 
 **Native Client** is a sandbox for running compiled C and C++ code in the
 browser efficiently and securely, independent of the user's operating system.
 **Portable Native Client** extends that technology with
 architecture independence, letting developers compile their code once to run
 in any website and on any architecture with ahead-of-time (AOT) translation.
 
 In short, Native Client brings the **performance** and **low-level control**
 of native code to modern web browsers, without sacrificing the **security** and
 **portability** of the web. Watch the video below for an overview of
 Native Client, including its goals, how it works, and how
 Portable Native Client lets developers run native compiled code on the web. 
 
 .. Note::
   :class: note
 
   This site uses several examples of Native Client. For the best experience,
   consider downloading the `latest version of Chrome 
-  <http://www.google.com/chrome/>`_. When you come back, be sure to `check out
+  <https://www.google.com/chrome/>`_. When you come back, be sure to `check out
   our demos <https://gonativeclient.appspot.com/demo>`_.
 
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   </div>
 
   <iframe class="video" width="600" height="337"
   src="//www.youtube.com/embed/MvKEomoiKBA?rel=0" frameborder="0"></iframe>
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 I Want to Know Everything
 =========================
 
 So, you like to read now and try later. Start with our :doc:`Technical Overview
 <overview>`
 
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   <div class="big-intro" style="clear: both;">
 
-Send us questions, comments, and feedback: `native-client-discuss 
-<https://groups.google.com/forum/#!forum/native-client-discuss>`_.
+Send us comments and feedback on the `native-client-discuss
+<https://groups.google.com/forum/#!forum/native-client-discuss>`_ mailing list,
+or ask questions using Stack Overflow's `google-nativeclient
+<https://stackoverflow.com/questions/tagged/google-nativeclient>`_ tag.
 
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   </div>