godoc: style example headings like links

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5819048

doc/style.css

@@ -30,11 +30,13 @@ pre .ln {
 body {
 	color: #222;
 }
-a {
+a,
+.exampleHeading .text {
 	color: #375EAB;
 	text-decoration: none;
 }
-a:hover {
+a:hover,
+.exampleHeading .text:hover {
 	text-decoration: underline;
 }
 p,

lib/godoc/example.html

 <div id="example_{{.Name}}" class="example">
 	<div class="collapsed">
-		<p class="exampleHeading">▹ Example{{example_suffix .Name}}</p>
+		<p class="exampleHeading">▹ <span class="text">Example{{example_suffix .Name}}</span></p>
 	</div>
 	<div class="expanded">
-		<p class="exampleHeading">▾ Example{{example_suffix .Name}}</p>
+		<p class="exampleHeading">▾ <span class="text">Example{{example_suffix .Name}}</span></p>
 		{{with .Doc}}<p>{{html .}}</p>{{end}}
 		<p>Code:</p>
 		<pre class="code">{{.Code}}</pre>