server: rewrite package comments in English (#96)

server/server.go

@@ -3,7 +3,8 @@
 // If you have downloaded a copy of the tRPC source code from Tencent,
 // please note that tRPC source code is licensed under the Apache 2.0 License that can be found in the LICENSE file.
 
-// Package server 服务端，包括网络通信 名字服务 监控统计 链路跟踪等各个组件基础接口，具体实现由第三方 middleware 注册进来
+// Package server provides a framework for managing multiple services within a single process.
+// A server process may listen on multiple ports, providing different services on different ports.
 package server
 
 import (