docs: change slot to # (#5858)

* docs(SwipeCell): change "slot" to "v-slot"

* docs(SwipeCell): change `v-slot` to`#`

* docs(cell): change `slot` to `#`

* docs(checkbox): change `slot` to `v-slot`

* docs(field): change `slot` to `v-slot`

* docs(checkbox): remove wrong comment

* docs(radio): change `slot` to `#`

* docs(search): change `slot` to `#`

* docs(slider): change `slot` to `#`

* docs(switch): change `slot` to `#`

* docs(PullRefresh): change `slot` to `#`

* docs(collapse): change `slot` to `#`

* docs(panel): change `slot` to `#`

* docs(swipe): change `slot` to `#`

* docs(navbar): change `slot` to `#`

* docs(tab): change `slot` to `#`

* docs(tabber): change `slot` to `#`

* docs(TreeSelect): change `slot` to `#`

* docs(card): change `slot` to `#`

* docs(submitBar): change `slot` to `#`

* docs(sku): change `slot` to `#` unsure

* docs(cell): delete waste blank line

* docs(panel): fix indentation

* docs(PullRefresh): change "count" to "Refresh Count"

* docs(radio): delete waste blank line

* docs(search): move props above the event

* docs(submitBar): delete waste `<span>`

* docs(swipCell): delete waste blank line

* docs(tabbar): merge `<img>` into one line

src/panel/README.md

@@ -24,10 +24,10 @@ Vue.use(Panel);
 ```html
 <van-panel title="Title" desc="Description" status="Status">
   <div>Content</div>
-  <div slot="footer">
+  <template #footer>
     <van-button size="small">Button</van-button>
     <van-button size="small" type="danger">Button</van-button>
-  </div>
+  </template>
 </van-panel>
 ```
 

src/panel/README.zh-CN.md

@@ -28,10 +28,10 @@ Vue.use(Panel);
 ```html
 <van-panel title="标题" desc="描述信息" status="状态">
   <div>内容</div>
-  <div slot="footer">
+  <template #footer>
     <van-button size="small">按钮</van-button>
     <van-button size="small" type="danger">按钮</van-button>
-  </div>
+  </template>
 </van-panel>
 ```