文档小细节优化 (#6)

* fix: loading small style, search style and dialog style

* fix: scroll to top

* fix mobile scroll

* fix scroll to top

* 文档细节优化

docs/examples-dist/waterfall.vue

@@ -11,6 +11,8 @@
 
               </example-block></section></template>
 <style>
+@component-namespace demo {
+  @b waterfall {
     .waterfall {
       max-height: 360px;
       overflow: scroll;
@@ -31,6 +33,8 @@
     .van-loading {
       margin: 10px auto;
     }
+  }
+}
 </style>
 <script>
 import Vue from "vue";import ExampleBlock from "components/example-block";Vue.component("example-block", ExampleBlock);

docs/examples-docs/quickstart.md

@@ -1,7 +1,7 @@
 ## Vant
 
 一套`Vue 2.0`的基础组件。
-A collection of essential UI components written with Vue 2.0.
+<br>A collection of essential UI components written with Vue 2.0.
 
 ### 安装
 

docs/examples-docs/waterfall.md

@@ -66,6 +66,8 @@ export default {
 </script>
 
 <style>
+@component-namespace demo {
+  @b waterfall {
     .waterfall {
       max-height: 360px;
       overflow: scroll;
@@ -86,6 +88,8 @@ export default {
     .van-loading {
       margin: 10px auto;
     }
+  }
+}
 </style>
 
 #### 基础用法