Document that SetFailed sets status_code as well

docs/cn/server.md

@@ -135,7 +135,7 @@ public:
 
 调用Controller.SetFailed()可以把当前调用设置为失败，当发送过程出现错误时，框架也会调用这个函数。用户一般是在服务的CallMethod里调用这个函数，比如某个处理环节出错，SetFailed()后确认done->Run()被调用了就可以跳出函数了(若使用了ClosureGuard，跳出函数时会自动调用done，不用手动)。Server端的done的逻辑主要是发送response回client，当其发现用户调用了SetFailed()后，会把错误信息送回client。client收到后，它的Controller::Failed()会为true（成功时为false），Controller::ErrorCode()和Controller::ErrorText()则分别是错误码和错误信息。
 
-用户可以为http访问设置[status-code](http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html)，在server端一般是调用`controller.http_response().set_status_code()`，标准的status-code定义在[http_status_code.h](https://github.com/brpc/brpc/blob/master/src/brpc/http_status_code.h)中。如果SetFailed了但没有设置status-code，框架会代为选择和错误码最接近的status-code，实在没有相关的则填brpc::HTTP_STATUS_INTERNAL_SERVER_ERROR（500错误）
+用户可以为http访问设置[status-code](http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html)，在server端一般是调用`controller.http_response().set_status_code()`，标准的status-code定义在[http_status_code.h](https://github.com/brpc/brpc/blob/master/src/brpc/http_status_code.h)中。Controller.SetFailed也会设置status-code，值是与错误码含义最接近的status-code，没有相关的则填500错误(brpc::HTTP_STATUS_INTERNAL_SERVER_ERROR)。如果你要覆盖status_code，设置代码一定要放在SetFailed()后，而不是之前。
 
 ## 获取Client的地址
 

docs/en/server.md

@@ -137,7 +137,7 @@ public:
 
 Call Controller.SetFailed() to set the RPC to be failed. If error occurs during sending response, framework calls the method as well. Users often call the method in services' CallMethod(), For example if a stage of processing fails, user calls SetFailed() and call done->Run(), then quit CallMethod (If ClosureGuard is used, done->Run() is called automatically). The server-side done is created by framework and contains code sending response back to client. If SetFailed() is called, error information is sent to client instead of normal content. When client receives the response, its controller will be SetFailed() as well and Controller::Failed() will be true. In addition, Controller::ErrorCode() and Controller::ErrorText() are error code and error information respectively.
 
-User may set [status-code](http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html) for http calls by calling `controller.http_response().set_status_code()` at server-side. Standard status-code are defined in [http_status_code.h](https://github.com/brpc/brpc/blob/master/src/brpc/http_status_code.h). If SetFailed() is called but status-code is not set, brpc chooses status-code with closest semantics to the error-code. brpc::HTTP_STATUS_INTERNAL_SERVER_ERROR(500) is chosen at worst.
+User may set [status-code](http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html) for http calls by calling `controller.http_response().set_status_code()` at server-side. Standard status-code are defined in [http_status_code.h](https://github.com/brpc/brpc/blob/master/src/brpc/http_status_code.h). Controller.SetFailed() sets status-code as well with the value closest to the error-code in semantics. brpc::HTTP_STATUS_INTERNAL_SERVER_ERROR(500) is chosen when there's no proper value.
 
 ## Get address of client