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/tabbar/README.zh-CN.md

@@ -79,11 +79,9 @@ export default {
 <van-tabbar v-model="active">
   <van-tabbar-item badge="3">
     <span>自定义</span>
-    <img
-      slot="icon"
-      slot-scope="props"
-      :src="props.active ? icon.active : icon.inactive"
-    >
+      <template #icon="props">
+        <img :src="props.active ? icon.active : icon.inactive"/>
+      </template>
   </van-tabbar-item>
   <van-tabbar-item icon="search">标签</van-tabbar-item>
   <van-tabbar-item icon="setting-o">标签</van-tabbar-item>