Automatically add links to API-docs in examples

When we create the examples, we know exactly which specific `ol.…` symbols
we `goog.require(…)`. We can create links to the API documentation of these
symbols automatically.

examples/resources/layout.css

@@ -18,6 +18,9 @@ body {
 #tags, #shortdesc, .hidden {
   display: none;
 }
+#api-links ul {
+  display: inline;
+}
 
 body, h1, h2, h3, h4, p, li, td, th {
   font-family: Quattrocento Sans;