Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/devguide/tutorial/index.html

Index: native_client_sdk/doc_generated/devguide/tutorial/index.html
diff --git a/native_client_sdk/doc_generated/devguide/tutorial/index.html b/native_client_sdk/doc_generated/devguide/tutorial/index.html
index a2b529a9947569ad9522e457fb4e1d30747832cc..f4d116feeeb88f8d45e7157b52e5b8addf48680e 100644
--- a/native_client_sdk/doc_generated/devguide/tutorial/index.html
+++ b/native_client_sdk/doc_generated/devguide/tutorial/index.html
@@ -1,7 +1,15 @@
 {{+bindTo:partials.standard_nacl_article}}
 
-<section id="tutorial">
-<span id="devguide-tutorial-index"></span><h1 id="tutorial"><span id="devguide-tutorial-index"></span>Tutorial</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="tutorial">
+<h1 id="tutorial">Tutorial</h1>
 <p>This section contains a multi-part tutorial that explains how to get started
 developing applications with Native Client.</p>
 <ul class="small-gap">