docs: update changelog

content/start/changelog/index-en-US.md

@@ -18,6 +18,7 @@ Version：Major.Minor.Patch (follow the **Semver** specification)
 
 
 #### 🎉 2.15.1 (2022-07-19)
+- 【Fix】
     - Fix the problem that @douyinfe/semi-illustrations failed to shaking [#961](https://github.com/DouyinFE/semi-design/issues/961)
     - Fix the warning that the name of the custom attribute data-popupId is not lowercase [#969](https://github.com/DouyinFE/semi-design/issues/969)（影响范围 2.15.0）
 

content/start/changelog/index.md

@@ -17,6 +17,7 @@ Semi 版本号遵循 **Semver** 规范（主版本号-次版本号-修订版本
 ---
 
 #### 🎉 2.15.1 (2022-07-19)
+- 【Fix】
     - 修复 @douyinfe/semi-illustrations 插画按需加载失效的问题 [#961](https://github.com/DouyinFE/semi-design/issues/961)
     - 修复自定义属性data-popupId名称没有小写导致的warning[#969](https://github.com/DouyinFE/semi-design/issues/969)（影响范围 2.15.0）