Add @classdesc to classes

src/ol/tilegrid/tilegrid.js

@@ -15,6 +15,10 @@ goog.require('ol.proj.Units');
 
 
 /**
+ * @classdesc
+ * Base class for setting the grid pattern for sources accessing tiled-image
+ * servers.
+ *
  * @constructor
  * @param {olx.tilegrid.TileGridOptions} options Tile grid options.
  * @struct

src/ol/tilegrid/wmtstilegrid.js

@@ -8,6 +8,9 @@ goog.require('ol.tilegrid.TileGrid');
 
 
 /**
+ * @classdesc
+ * Set the grid pattern for sources accessing WMTS tiled-image servers.
+ *
  * @constructor
  * @extends {ol.tilegrid.TileGrid}
  * @param {olx.tilegrid.WMTSOptions} options WMTS options.

src/ol/tilegrid/xyztilegrid.js

@@ -11,6 +11,9 @@ goog.require('ol.tilegrid.TileGrid');
 
 
 /**
+ * @classdesc
+ * Set the grid pattern for sources accessing XYZ tiled-image servers.
+ *
  * @constructor
  * @extends {ol.tilegrid.TileGrid}
  * @param {olx.tilegrid.XYZOptions} options XYZ options.

src/ol/tilegrid/zoomifytilegrid.js

@@ -8,6 +8,9 @@ goog.require('ol.tilegrid.TileGrid');
 
 
 /**
+ * @classdesc
+ * Set the grid pattern for sources accessing Zoomify tiled-image servers.
+ *
  * @constructor
  * @extends {ol.tilegrid.TileGrid}
  * @param {olx.tilegrid.ZoomifyOptions=} opt_options Options.