Adds more documentation to RequestScheduler
Adds more documentation to RequestScheduler

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