Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/devguide/coding/file-io.html

Index: native_client_sdk/doc_generated/devguide/coding/file-io.html
diff --git a/native_client_sdk/doc_generated/devguide/coding/file-io.html b/native_client_sdk/doc_generated/devguide/coding/file-io.html
index 571415f2c20c18c21b4fa2f0ffa4a9245f139789..6288691f9b2d6bb2691e1a68a12c8775377f3c3e 100644
--- a/native_client_sdk/doc_generated/devguide/coding/file-io.html
+++ b/native_client_sdk/doc_generated/devguide/coding/file-io.html
@@ -1,7 +1,15 @@
 {{+bindTo:partials.standard_nacl_article}}
 
-<section id="file-i-o">
-<span id="devguide-coding-fileio"></span><h1 id="file-i-o"><span id="devguide-coding-fileio"></span>File I/O</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="file-i-o">
+<h1 id="file-i-o">File I/O</h1>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#introduction" id="id2">Introduction</a></li>