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/submit-bar/README.md

@@ -60,9 +60,9 @@ Use slot to add custom contents.
   @submit="onSubmit"
 >
   <van-checkbox v-model="checked">Check</van-checkbox>
-  <span slot="tip">
-    Some tips, <span @click="onClickEditAddress">Link</span>
-  </span>
+    <template #tip>
+        Some tips, <span @click="onClickEditAddress">Link</span>
+    </template>
 </van-submit-bar>
 ```
 

src/submit-bar/README.zh-CN.md

@@ -60,9 +60,9 @@ Vue.use(SubmitBar);
   @submit="onSubmit"
 >
   <van-checkbox v-model="checked">全选</van-checkbox>
-  <span slot="tip">
-    你的收货地址不支持同城送, <span>修改地址</span>
-  </span>
+    <template #tip>
+        你的收货地址不支持同城送, <span @click="onClickEditAddress">修改地址</span>
+    </template>
 </van-submit-bar>
 ```