Update our search code for the doc site.

docsite/_themes/srtd/searchbox.html

@@ -6,7 +6,7 @@
 
 <script>
   (function() {
-    var cx = '015514069825911246756:eu5pbnxp4po';
+    var cx = '006019874985968165468:eu5pbnxp4po';
     var gcse = document.createElement('script');
     gcse.type = 'text/javascript';
     gcse.async = true;