DevTools: NetworkPanel: show link where resource timing is explained.

Source/devtools/front_end/network/RequestTimingView.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 153 matching lines @@
         createCommunicationTimingTable();
     if (request.endTime !== -1)
         addRow(WebInspector.UIString("Content Download"), "receiving", (request.responseReceivedTime - timing.requestTime) * 1000, total);
 
     if (!request.finished) {
         var cell = tableElement.createChild("tr").createChild("td", "caution");
         cell.colSpan = 2;
         cell.createTextChild(WebInspector.UIString("CAUTION: request is not finished yet!"));
     }
 
+    var note = tableElement.createChild("tr").createChild("td", "footnote");
+    note.colSpan = 2;
+    note.appendChild(WebInspector.createDocumentationAnchor("network#resource-network-timing", WebInspector.UIString("Explanation of resource timing")));
+
     return tableElement;
 }