Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/nacldev.html

Index: native_client_sdk/doc_generated/nacldev.html
diff --git a/native_client_sdk/doc_generated/nacldev.html b/native_client_sdk/doc_generated/nacldev.html
index 8ca68112a514d3a5b9f08974f7ffbbf0aceb4ce1..2b070b692bbf623f3cab55c9820f235c6913aa84 100644
--- a/native_client_sdk/doc_generated/nacldev.html
+++ b/native_client_sdk/doc_generated/nacldev.html
@@ -1,7 +1,15 @@
 {{+bindTo:partials.standard_nacl_article}}
 
-<section id="nacl-dev-environment">
-<span id="nacldev"></span><h1 id="nacl-dev-environment"><span id="nacldev"></span>NaCl Dev Environment</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="nacl-dev-environment">
+<h1 id="nacl-dev-environment">NaCl Dev Environment</h1>
 <h2 id="feature-status">Feature Status</h2>
 <p>Here is a summary of feature status. We hope to overcome these limitations
 in the near future:</p>