docs(image): showError showLoading props CamelCase

src/packages/__VUE/image/doc.en-US.md

@@ -134,8 +134,8 @@ The Image component provides a default loading failure warning and supports cust
 | height         | Height，Default unit px              | String | -                |
 | round         | Whether to be round               | Boolean | false              |
 | radius         | Border Raduis               | String \| Numer | -                |
-| showError         | Whether to show error placeholder | Boolean | false              |
-| showLoading         | Whether to show loading placeholder | Boolean | true              |
+| show-error         | Whether to show error placeholder | Boolean | false              |
+| show-loading         | Whether to show loading placeholder | Boolean | true              |
 
 ### ImageFit 
 

src/packages/__VUE/image/doc.md

@@ -133,8 +133,8 @@ app.use();
 | height         | 高度，默认单位`px`               | String | -                |
 | round         | 是否显示为圆角               | Boolean | false              |
 | radius         | 圆角大小               | String \| Numer | -                |
-| showError         | 是否展示图片加载失败| Boolean | false              |
-| showLoading         | 是否展示加载中图片               | Boolean | true              |
+| show-error         | 是否展示图片加载失败| Boolean | false              |
+| show-loading         | 是否展示加载中图片               | Boolean | true              |
 
 ### ImageFit 图片填充模式