Add more content for the API doc

Involves additions to (there will be subsequent pull requests for other
classes):
- ol.Attribution
- ol.Collection
- ol.Expression
- ol.Feature
- ol.Geolocation
- ol.Map
- ol.Object
- ol.Overlay
- ol.Projection
- ol.View2D
- ol.control.Attribution
- ol.control.Control
- ol.control.FullScreen
- ol.control.Logo
- ol.control.MousePosition
- ol.control.ScaleLine
- ol.control.Zoom
- ol.control.ZoomSlider
- ol.dom.Input
- ol.filter.Filter
- ol.filter.Geometry
- ol.filter.Logical

src/ol/control/control.js

@@ -9,8 +9,8 @@ goog.require('ol.MapEventType');
 
 
 /**
- * A thing which is painted over the map to provide a means for interaction
- * (buttons) of show annotations (status bars).
+ * Something to be painted over the map to provide a means for interaction
+ * (buttons) or to show annotations (status bars).
  *
  * @constructor
  * @extends {goog.Disposable}
@@ -63,6 +63,7 @@ ol.control.Control.prototype.disposeInternal = function() {
 
 
 /**
+ * Get the map associated with this control.
  * @return {ol.Map} Map.
  */
 ol.control.Control.prototype.getMap = function() {