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/tree-select/README.md

@@ -63,7 +63,7 @@ export default {
   :items="items"
   :main-active-index.sync="active"
 >
-  <template slot="content">
+  <template #content>
     <van-image v-if="active === 0" src="https://img.yzcdn.cn/vant/apple-1.jpg" />
     <van-image v-if="active === 1" src="https://img.yzcdn.cn/vant/apple-2.jpg" />
   </template>

src/tree-select/README.zh-CN.md

@@ -69,7 +69,7 @@ export default {
   :items="items"
   :main-active-index.sync="active"
 >
-  <template slot="content">
+  <template #content>
     <van-image v-if="active === 0" src="https://img.yzcdn.cn/vant/apple-1.jpg" />
     <van-image v-if="active === 1" src="https://img.yzcdn.cn/vant/apple-2.jpg" />
   </template>