Docs: Add Data Saver doc for N release

Bug: 27247925
Change-Id: I41f4c98ec036f52528a88c18e4235241b2fe3aec
diff --git a/src/devices/devices_toc.cs b/src/devices/devices_toc.cs
index 71053c1..08cb63d 100644
--- a/src/devices/devices_toc.cs
+++ b/src/devices/devices_toc.cs
@@ -314,6 +314,7 @@
         </div>
         <ul>
           <li><a href="<?cs var:toroot ?>devices/tech/connect/block-numbers.html">Block Phone Numbers</a></li>
+          <li><a href="<?cs var:toroot ?>devices/tech/connect/data-saver.html">Data Saver Mode</a></li>
           <li><a href="<?cs var:toroot ?>devices/tech/connect/felica.html">Host Card Emulation of FeliCa</a></li>
         </ul>
       </li>