docs: update vant-weapp demo

src/search/README.md

@@ -102,8 +102,8 @@ Use `action` slot to custom right button, `cancel` event will no longer be trigg
 <van-search
   v-model="value"
   show-action
-  shape="round"
   label="Address"
+  placeholder="Placeholder"
   @search="onSearch"
 >
   <template #action>

src/search/README.zh-CN.md

@@ -102,8 +102,8 @@ export default {
 <van-search
   v-model="value"
   show-action
-  placeholder="请输入搜索关键词"
   label="地址"
+  placeholder="请输入搜索关键词"
   @search="onSearch"
 >
   <template #action>

src/search/demo/index.vue

@@ -40,9 +40,9 @@
     <demo-block :title="$t('customButton')">
       <van-search
         v-model="value6"
-        :placeholder="$t('placeholder')"
         show-action
         :label="$t('label')"
+        :placeholder="$t('placeholder')"
         @search="onSearch"
       >
         <template #action>