Fix some JSDoc issues

Also makes a few minor changes to the template, so it can be used until
we have a new doc generation process. JSDoc output is written to
build/apidoc.

config/jsdoc/api/plugins/observable.js

@@ -47,7 +47,7 @@ exports.handlers = {
         if (!cls.fires) {
           cls.fires = [];
         }
-        event = 'ol.Object.Event#event:change:' + name;
+        event = 'module:ol/Object~ObjectEvent#event:change:' + name;
         if (cls.fires.indexOf(event) == -1) {
           cls.fires.push(event);
         }