[DOC]: Send a message with an image Unable to use {self.api_base_url}/msg/send_msg

[darrenwang00]

Documentation Updates

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http://host:10002/msg/send_msg
发送图片消息的时候， url不能为空
文档没找到 类似与 sendMessageNotOss的方法

建议: openim-server server端的 http api调用， 消息发送部分可以多一些例子
支持哪些uri 也可以单独列一下

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