Fix JSDoc for exportKml
Fix JSDoc for exportKml

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