fix links to performance in readme

README.md

@@ -21,7 +21,7 @@ You can use it to:
   * Access service [synchronously](docs/en/client.md#synchronus-call) or [asynchronously](docs/en/client.md#asynchronous-call), or even [semi-synchronously](docs/en/client.md#semi-synchronous-call).
   * Use [combo channels](docs/en/combo_channel.md) to simplify complicated client patterns declaratively, including sharded and parallel accesses.
 * Debug services [via http](docs/en/builtin_service.md), and run  [cpu](docs/cn/cpu_profiler.md), [heap](docs/cn/heap_profiler.md) and [contention](docs/cn/contention_profiler.md) profilers.
-* Get [better latency and throughput](#better-latency-and-throughput).
+* Get [better latency and throughput](docs/en/overview.md#better-latency-and-throughput).
 * [Extend brpc](docs/en/new_protocol.md) with the protocols used in your organization quickly, or customize components, including [naming services](docs/cn/load_balancing.md#名字服务) (dns, zk, etcd), [load balancers](docs/cn/load_balancing.md#负载均衡) (rr, random, consistent hashing)
 
 # Try it!

README_cn.md

@@ -22,7 +22,7 @@
   * 通过[同步](docs/cn/client.md#同步访问)、[异步](docs/cn/client.md#异步访问)或[半同步](docs/cn/client.md#半同步)访问服务。
   * 使用[组合channels](docs/cn/combo_channel.md)声明式地简化复杂的分库或并发访问。
 * [通过http](docs/cn/builtin_service.md)调试服务, 使用[cpu](docs/cn/cpu_profiler.md), [heap](docs/cn/heap_profiler.md), [contention](docs/cn/contention_profiler.md) profilers.
-* 获得[更好的延时和吞吐](#更好的延时和吞吐).
+* 获得[更好的延时和吞吐](docs/cn/overview.md#更好的延时和吞吐).
 * 把你组织中使用的协议快速地[加入brpc](docs/cn/new_protocol.md)，或定制各类组件, 包括[名字服务](docs/cn/load_balancing.md#名字服务) (dns, zk, etcd), [负载均衡](docs/cn/load_balancing.md#负载均衡) (rr, random, consistent hashing)
 
 # 试一下!