docs(element): docs (#528)

src/element/demos/enUS/basic.demo.md

@@ -22,15 +22,15 @@ You can use CSS variables from it. If you need to use those variables in JS, ple
 ```
 
 ```js
-import { ref } from 'vue'
+import { defineComponent, ref } from 'vue'
 import { darkTheme } from 'naive-ui'
 
-export default {
+export default defineComponent({
   setup () {
     return {
       darkTheme,
       theme: ref(null)
     }
   }
-}
+})
 ```

src/element/demos/enUS/index.demo-entry.md

@@ -16,6 +16,6 @@ basic
 
 ## Slots
 
-| Name    | Parameters | Description |
-| ------- | ---------- | ----------- |
-| default | `()`       |             |
+| Name    | Parameters | Description                 |
+| ------- | ---------- | --------------------------- |
+| default | `()`       | The content of the element. |

src/element/demos/zhCN/basic.demo.md

@@ -22,15 +22,15 @@
 ```
 
 ```js
-import { ref } from 'vue'
+import { defineComponent, ref } from 'vue'
 import { darkTheme } from 'naive-ui'
 
-export default {
+export default defineComponent({
   setup () {
     return {
       darkTheme,
       theme: ref(null)
     }
   }
-}
+})
 ```

src/element/demos/zhCN/index.demo-entry.md

@@ -16,6 +16,6 @@ basic
 
 ## Slots
 
-| 名称    | 参数 | 说明 |
-| ------- | ---- | ---- |
-| default | `()` |      |
+| 名称    | 参数 | 说明     |
+| ------- | ---- | -------- |
+| default | `()` | 元素内容 |