update toc

book/contents/SUMMARY.md

@@ -96,7 +96,7 @@
     - [单元测试和集成测试](test/unit-integration-test.md)
     - [断言assertion](test/assertion.md)
     - [用Github Actions进行持续集成](test/ci.md)
-    - [基准测试benchmark todo](test/benchmark.md)
+    - [基准测试benchmark](test/benchmark.md)
 
 - [async/await异步编程](async/intro.md)
   - [async编程入门](async/getting-started.md)