Modify the sink doc according to the review advice
Modify the sink doc according to the review advice

huangyuqi/heapster,whuwxl/heapster,AlmogBaku/heapster,adfin/statster,shilpamayanna/heapster,afein/heapster,taimir/heapster,adfin/statster,AlmogBaku/heapster,vicki-c/heapster,liubog2008/heapster,luxas/heapster,jackzampolin/heapster,whuwxl/heapster,aegixx/heapster,mwielgus/heapster,skytap/heapster,liubog2008/heapster,bluebreezecf/heapster,Stackdriver/heapster,krzyzacy/heapster,wulonghui/heapster,Huawei-PaaS/heapster,Huawei-PaaS/heapster,krzyzacy/heapster,saiwl/heapster,skytap/heapster,burmanm/heapster,jackzampolin/heapster,johanneswuerbach/heapster,bluebreezecf/heapster,mwringe/heapster,luxas/heapster,piosz/heapster,mwielgus/heapster,burmanm/heapster,wulonghui/heapster,Stackdriver/heapster,piosz/heapster,huangyuqi/heapster,afein/heapster,taimir/heapster,mwringe/heapster,saiwl/heapster,titilambert/heapster,a-robinson/heapster,shilpamayanna/heapster,bruceauyeung/heapster,andyxning/heapster,andyxning/heapster,titilambert/heapster,vicki-c/heapster,a-robinson/heapster,bruceauyeung/heapster,aegixx/heapster,johanneswuerbach/heapster