Make WMSServerType appear in API docs

src/ol/source/WMSServerType.js

@@ -9,8 +9,24 @@
  * @enum {string}
  */
 export default {
+  /**
+   * HiDPI support for [Carmenta Server](https://www.carmenta.com/en/products/carmenta-server)
+   * @api
+   */
   CARMENTA_SERVER: 'carmentaserver',
+  /**
+   * HiDPI support for [GeoServer](https://geoserver.org/)
+   * @api
+   */
   GEOSERVER: 'geoserver',
+  /**
+   * HiDPI support for [MapServer](https://mapserver.org/)
+   * @api
+   */
   MAPSERVER: 'mapserver',
+  /**
+   * HiDPI support for [QGIS](https://qgis.org/)
+   * @api
+   */
   QGIS: 'qgis'
 };