Merge pull request #1151 from pklim101/master

Update nshead_service.md
diff --git a/docs/cn/nshead_service.md b/docs/cn/nshead_service.md
index 3bf873d..db18bed 100644
--- a/docs/cn/nshead_service.md
+++ b/docs/cn/nshead_service.md
@@ -134,7 +134,7 @@
     butil::IOBuf body;
 };
  
-// 实现这个类并复制给ServerOptions.nshead_service来让brpc处理nshead请求。
+// 实现这个类并赋值给ServerOptions.nshead_service来让brpc处理nshead请求。
 class NsheadService : public Describable {
 public:
     NsheadService();