docs: uincloud API入口 增加访问云函数方法链接

docs/api/uniCloud.md

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 #### [clientDB访问云数据库](https://uniapp.dcloud.net.cn/uniCloud/hellodb)
+
 #### [客户端访问云函数](https://uniapp.dcloud.net.cn/uniCloud/cf-functions)
+
+|API						|描述																					|
+|--							|--																						|
+|uniCloud.callFunction()	|云函数中调用另一个云函数 [详情](https://uniapp.dcloud.net.cn/uniCloud/cf-functions?id=callbyfunction)				|
+|uniCloud.database()		|云数据库对象 [详情](https://uniapp.dcloud.net.cn/uniCloud/cf-database.md)											|
+|uniCloud.uploadFile()		|云函数上传文件到云存储 [详情](https://uniapp.dcloud.net.cn/uniCloud/storage?id=uploadfile)							|
+|uniCloud.downloadFile()	|云函数下载云存储的文件到云函数运行环境 [详情](https://uniapp.dcloud.net.cn/uniCloud/storage?id=clouddownloadfile)	|
+|uniCloud.deleteFile()		|云函数删除云存储的文件 [详情](https://uniapp.dcloud.net.cn/uniCloud/storage?id=deletefile)							|
+|uniCloud.getTempFileURL()	|获取云存储文件的临时路径 [详情](https://uniapp.dcloud.net.cn/uniCloud/storage?id=gettempfileurl)					|
+|uniCloud.httpclient		|云函数中通过http连接其他系统 [详情](https://uniapp.dcloud.net.cn/uniCloud/cf-functions?id=httpclient)				|
+|uniCloud.logger			|云函数中打印日志到uniCloud日志记录系统（非HBuilderX控制台）[详情](https://uniapp.dcloud.net.cn/uniCloud/cf-logger)	|
+|uniCloud.sendSms()			|发送短信 [详情](https://uniapp.dcloud.net.cn/uniCloud/send-sms.md)													|
+
+
 #### [客户端访问云存储](https://uniapp.dcloud.net.cn/uniCloud/storage)