Rename method and make it appear in the API docs

src/ol/style.js

@@ -2,4 +2,8 @@ goog.provide('ol.style');
 
 goog.require('ol.style.IconImageCache');
 
+/**
+ * The {@link ol.style.IconImageCache} for {@link ol.style.Icon} images.
+ * @api
+ */
 ol.style.iconImageCache = new ol.style.IconImageCache();

src/ol/style/iconimagecache.js

@@ -4,6 +4,7 @@ goog.require('ol.color');
 
 
 /**
+ * Singleton class. Available through {@link ol.style.iconImageCache}.
  * @constructor
  */
 ol.style.IconImageCache = function() {
@@ -93,10 +94,13 @@ ol.style.IconImageCache.prototype.set = function(src, crossOrigin, color, iconIm
 
 
 /**
- * Set cache max size.
+ * Set the cache size of the icon cache. Default is `32`. Change this value when
+ * your map uses more than 32 different icon images and you are not caching icon
+ * styles on the application level.
  * @param {number} maxCacheSize Cache max size.
+ * @api
  */
-ol.style.IconImageCache.prototype.setMaxCacheSize = function(maxCacheSize) {
+ol.style.IconImageCache.prototype.setSize = function(maxCacheSize) {
   this.maxCacheSize_ = maxCacheSize;
   this.expire();
 };