docs: add guide of safe-area-inset-bottom (#4418)

src/goods-action/demo/index.vue

@@ -14,7 +14,7 @@
       <van-goods-action>
         <van-goods-action-icon icon="chat-o" :text="$t('icon1')" />
         <van-goods-action-icon icon="cart-o" info="5" :text="$t('icon2')" />
-        <van-goods-action-icon icon="shop-o" :text="$t('icon3')" />
+        <van-goods-action-icon icon="shop-o" info="12" :text="$t('icon3')" />
         <van-goods-action-button type="warning" :text="$t('button1')" />
         <van-goods-action-button type="danger" :text="$t('button2')" />
       </van-goods-action>
@@ -42,7 +42,7 @@ export default {
       icon3: '店铺',
       button1: '加入购物车',
       button2: '立即购买',
-      title2: '图标提示',
+      title2: '徽标提示',
       customButtonColor: '自定义按钮颜色'
     },
     'en-US': {