!251 readme fix

Merge pull request !251 from 叶翔斌/yxb_001

README.md

@@ -44,13 +44,13 @@ OpenHarmony supports the following system types:
 
 ```
 /test/xts
-├── acts                 # Test code
+├── acts                # Test code
 │   └── subsystem       # Source code of subsystem test cases for the standard system
 │   └── subsystem_lite  # Source code of subsystems test cases for mini and small systems
 │   └── BUILD.gn        # Build configuration of test cases for the standard system
 │   └── build_lite      
 │       └── BUILD.gn    # Build configuration of test cases for mini and small systems
-└── tools                # Test tool code
+└── tools               # Test tool code
 ```
 
 ## Constraints<a name="section119744591305"></a>

README_zh.md

@@ -45,13 +45,13 @@ OpenHarmony支持如下几种系统类型：
 
 ```
 /test/xts
-├── acts                 # 测试代码存放目录
+├── acts                # 测试代码存放目录
 │   └── subsystem       # 标准系统子系统测试用例源码存放目录
 │   └── subsystem_lite  # 轻量系统、小型系统子系统测试用例源码存放目录
 │   └── BUILD.gn        # 标准系统测试用例编译配置
 │   └── build_lite      # 轻量系统、小型系统测试用例编译配置存放目录
 │       └── BUILD.gn    # 轻量系统、小型系统测试用例编译配置
-└── tools                # 测试工具代码存放目录
+└── tools               # 测试工具代码存放目录
 ```
 
 ## 约束<a name="section119744591305"></a>