fix(docs): 修复 markdown 无法正确编译注释 (#3158)

Author: oasis-cloud

src/sites/sites-react/doc/docs/react/migrate-from-v2.en-US.md

@@ -283,6 +283,7 @@ If your project uses these components, please read the documentation carefully a
 - Added `height` attribute to control height
 - Added `duration` attribute to control animation duration
 - Added `size` attribute to select from built-in component heights
+
   [//]: # '#### Steps'
   [//]: # '#### Step'
   [//]: # '#### Swiper'

src/sites/sites-react/doc/docs/react/migrate-from-v2.md

@@ -300,6 +300,7 @@ plugins: [
 - 新增 `height` 属性，控制高度
 - 新增 `duration` 属性，控制动画时长
 - 新增 `size` 属性，通过 `size` 属性可选择使用组件内置的高度
+
   [//]: # '#### Steps'
   [//]: # '#### Step'
   [//]: # '#### Swiper'

src/sites/sites-react/doc/docs/taro/migrate-from-v2.en-US.md

@@ -283,6 +283,7 @@ If your project uses these components, please read the documentation carefully a
 - Added `height` attribute to control height
 - Added `duration` attribute to control animation duration
 - Added `size` attribute to select from built-in component heights
+
   [//]: # '#### Steps'
   [//]: # '#### Step'
   [//]: # '#### Swiper'

src/sites/sites-react/doc/docs/taro/migrate-from-v2.md

@@ -299,6 +299,7 @@ plugins: [
 - 新增 `height` 属性，控制高度
 - 新增 `duration` 属性，控制动画时长
 - 新增 `size` 属性，通过 `size` 属性可选择使用组件内置的高度
+
   [//]: # '#### Steps'
   [//]: # '#### Step'
   [//]: # '#### Swiper'