update the limit of sceneId in docs
update the limit of sceneId in docs

http://mp.weixin.qq.com/wiki/index.php?title=%E7%94%9F%E6%88%90%E5%B8%A6%E5%8F%82%E6%95%B0%E7%9A%84%E4%BA%8C%E7%BB%B4%E7%A0%81
jsRuner/wechat,15921050052/wechat,flybird119/wechat,Misfit-Wearables/wechat,MarcoPai/wechat,coogleyou/wechat,boyouzhao/wechat,dut3062796s/wechat-1,kmshi/wechat,gududefengzhong/wechat-4,beesui/wechat-iot,IceWilder/wechat,turingou/wechat,adrianzhang/wechat,wxhuang/wechat,boyouzhao/wechat,jiangbophd/wechat,junjun16818/wechat,klbjlabs/wechat,xc145214/wechat,countdracular/wechat,Jonekee/wechat,boyouzhao/wechat,iamcc/wechat,JKshare/wechat,guo-yu/wechat,nesta97432/wechat