fix typo in GeometryUpdater docs; s/entites/entities/
fix typo in GeometryUpdater docs; s/entites/entities/

YonatanKra/cesium,YonatanKra/cesium,likangning93/cesium,CesiumGS/cesium,CesiumGS/cesium,CesiumGS/cesium,AnalyticalGraphicsInc/cesium,YonatanKra/cesium,YonatanKra/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,progsung/cesium,progsung/cesium,likangning93/cesium,CesiumGS/cesium,CesiumGS/cesium,likangning93/cesium,likangning93/cesium