refer to busybox as well

docs/header.html

@@ -52,6 +52,7 @@
     <br><a href="/docs.html">Documentation</a>
 
     <p><b>Related Sites</b>
+    <br><a href="http://busybox.net/">BusyBox</a>
     <br><a href="http://uclibc.org/">uClibc.org</a>
     <br><a href="http://cxx.uclibc.org/">uClibc++</a>
     <br><a href="http://udhcp.busybox.net/">udhcp</a>