Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/cds2014/python.html

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-<section id="what-a-difference-python-makes-codelab">
-<span id="cds2014-python"></span><h1 id="what-a-difference-python-makes-codelab"><span id="cds2014-python"></span>What a Difference Python Makes - Codelab</h1>
+<b><font color="#cc0000">
+NOTE:
+Deprecation of the technologies described here has been announced
+for platforms other than ChromeOS.<br/>
+Please visit our
+<a href="/native-client/migration">migration guide</a>
+for details.
+</font></b>
+<hr/><section id="what-a-difference-python-makes-codelab">
+<h1 id="what-a-difference-python-makes-codelab">What a Difference Python Makes - Codelab</h1>
 <h2 id="introduction">Introduction</h2>
 <p>Learn how you can use client-side Python on your webpage.
 Use the python <a href="https://docs.python.org/2/library/difflib.html"
  target="_blank">difflib</a> module to generate attractive online
 textual diffs.
 Develop inside Google Chrome, using a hot off the presses version
 of our NaCl Dev Environment, running on a webpage,
 powered by Portable Native Client.
 The techniques in this codelab also apply to other interpreted languages
 we&#8217;ve ported to PNaCl, including: Python, Lua, Ruby, Tcl, Bash, and Forth.</p>
@@ skipping 218 matching lines @@
 <p>The Web-based version of the Chrome Dev Environment installs
 package data (&gt;800MB) into the HTML5 Filesystem storage associated
 with naclports.storage.googleapis.com .
 To recover this storage (i.e. uninstall),
 enter <strong>chrome://settings/cookies</strong> in the Chrome URL bar.
 In the cookies UI, search for &#8220;naclports&#8221;.
 Then click the &#8220;x&#8221; next to the naclports entry.</p>
 </section>
 
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