docs: Update for Android 23.0.4

Change-Id: I7025dcf9bbfd03b555f7f5059d0e35f67f836dcf
diff --git a/docs/html/preview/setup-sdk.jd b/docs/html/preview/setup-sdk.jd
index af466ab..a05baa7 100644
--- a/docs/html/preview/setup-sdk.jd
+++ b/docs/html/preview/setup-sdk.jd
@@ -202,10 +202,16 @@
   <li>Nexus 7 Wi-Fi (version 2, released in 2013)</li>
 </ul>
 
-<p>In addition, you also get the emulator system images, which includes
+<p>In addition, you also get the emulator system images, which include
 experimental 64-bit system images along with standard 32-bit system images.
 </p>
 
+<p class="note"><strong>Note:</strong> The 64-bit system images require the
+Intel x86 Emulator Accelerator (HAXM) Rev.5 which can be downloaded from the
+<a href="{@docRoot}tools/help/sdk-manager.html">SDK Manager</a><em>Extras</em> 
+folder.</p>
+
+
 <h3 id="installImage">Install the L Preview System Image</h3>
 
 <p class="warning"><b>Warning:</b> This is a preview version of the Android
@@ -218,6 +224,7 @@
 </p>
 
 
+
 <ol>
   <li>Download and uncompress the Android Developer Preview package.
     <table style="width:860px">
@@ -361,4 +368,4 @@
     }
   });
 
-</script>
\ No newline at end of file
+</script>