Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/reference/index.html

Index: native_client_sdk/doc_generated/reference/index.html
diff --git a/native_client_sdk/doc_generated/reference/index.html b/native_client_sdk/doc_generated/reference/index.html
index 9c1ba8b1982cec30833f30f9a154c5c7fa25f58f..10d2aadc9cfa97b0516eb2c38d6c7401e1a25a41 100644
--- a/native_client_sdk/doc_generated/reference/index.html
+++ b/native_client_sdk/doc_generated/reference/index.html
@@ -1,6 +1,14 @@
 {{+bindTo:partials.standard_nacl_article}}
 
-<section id="reference">
+<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="reference">
 <h1 id="reference">Reference</h1>
 <p>The reference section includes more in-depth details about some aspects of
 developing with Native Client, such as the NaCl manifest file format. In