feat(Stepper): add placeholder prop (#6519)

src/field/README.md

@@ -216,7 +216,7 @@ Use `input-align` prop to align the input value
 | type | Input type, can be set to `tel` `digit`<br>`number` `textarea` `password` | _string_ | `text` |
 | size | Size，can be set to `large` | _string_ | - |
 | maxlength | Max length of value | _number \| string_ | - |
-| placeholder | Placeholder | _string_ | - |
+| placeholder | Input placeholder | _string_ | - |
 | border | Whether to show inner border | _boolean_ | `true` |
 | disabled | Whether to disable field | _boolean_ | `false` |
 | readonly | Whether to be readonly | _boolean_ | `false` |

src/field/README.zh-CN.md

@@ -241,7 +241,7 @@ export default {
 | type | 输入框类型, 可选值为 `tel` `digit`<br>`number` `textarea` `password` 等 | _string_ | `text` |
 | size | 大小，可选值为 `large` | _string_ | - |
 | maxlength | 输入的最大字符数 | _number \| string_ | - |
-| placeholder | 占位提示文字 | _string_ | - |
+| placeholder | 输入框占位提示文字 | _string_ | - |
 | border | 是否显示内边框 | _boolean_ | `true` |
 | disabled | 是否禁用输入框 | _boolean_ | `false` |
 | readonly | 是否只读 | _boolean_ | `false` |