Fix duplicate documentation in EllipsoidGraphics.
Fix duplicate documentation in EllipsoidGraphics.

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