godoc: show contents in correct order, expand sections on click

R=dsymonds
CC=gobot, golang-dev
https://golang.org/cl/6588079

doc/godocs.js

@@ -208,6 +208,8 @@ function godocs_onload() {
   godocs_bindToggles("toggleVisible");
   godocs_bindToggleLinks("exampleLink", "example_");
   godocs_bindToggleLinks("overviewLink", "");
+  godocs_bindToggleLinks("examplesLink", "");
+  godocs_bindToggleLinks("indexLink", "");
 }
 
 bindEvent(window, 'load', godocs_onload);

lib/godoc/package.html

@@ -17,10 +17,10 @@
 			</dl>
 			<dl>
 			<dd><a href="#pkg-overview" class="overviewLink">Overview</a></dd>
-			<dd><a href="#pkg-index">Index</a></dd>
 			{{if $.Examples}}
-				<dd><a href="#pkg-examples">Examples</a></dd>
+				<dd><a href="#pkg-examples" class="examplesLink">Examples</a></dd>
 			{{end}}
+			<dd><a href="#pkg-index" class="indexLink">Index</a></dd>
 			{{if $.Dirs}}
 				<dd><a href="#pkg-subdirectories">Subdirectories</a></dd>
 			{{end}}