Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/overview.html

Index: native_client_sdk/doc_generated/overview.html
diff --git a/native_client_sdk/doc_generated/overview.html b/native_client_sdk/doc_generated/overview.html
index bf037b6de7b2a90a8d74158b357052855c4258c0..f77d25e608d3683f3a4fa471df05221734f6217a 100644
--- a/native_client_sdk/doc_generated/overview.html
+++ b/native_client_sdk/doc_generated/overview.html
@@ -1,7 +1,15 @@
 {{+bindTo:partials.standard_nacl_article}}
 
-<section id="technical-overview">
-<span id="overview"></span><h1 id="technical-overview"><span id="overview"></span>Technical Overview</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="technical-overview">
+<h1 id="technical-overview">Technical Overview</h1>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#why-use-native-client" id="id7">Why use Native Client?</a></li>