docs: slot -> #, update deps

one/docs/demo/alert/extra.vue

@@ -6,10 +6,10 @@
     message="恭喜你，你的请求已成功处理"
     closable
   >
-    <template slot="title">
+    <template #title>
       恭喜你
     </template>
-    <template slot="extra">
+    <template #extra>
       <veui-button ui="text">
         查看详情
       </veui-button>

one/docs/demo/alert/title.vue

@@ -10,7 +10,7 @@
     type="success"
   >
     Your profile has been updated.
-    <template slot="title">
+    <template #title>
       消息标题
     </template>
   </veui-alert>
@@ -27,7 +27,7 @@ export default {
 }
 </script>
 
-<style lang="less" scoped docs>
+<style lang="less" scoped>
 .veui-alert {
   margin-bottom: 20px;
 }