feat(rpx2px): 调整示例界面

pages/API/rpx2px/rpx2px.uvue

@@ -7,7 +7,7 @@
       <view>
         <view class="item">
           <text class="item-k">输入:</text>
-          <text class="item-v">{{rpxValue}}</text>
+          <text class="item-v">{{rpxValue}}rpx</text>
         </view>
         <view class="item">
           <text class="item-k">返回:</text>
@@ -15,7 +15,7 @@
         </view>
       </view>
       <view>
-        <button type="primary" @tap="rpx2px">转换</button>
+        <button type="primary" @click="rpx2px">转换</button>
       </view>
     </view>
   <!-- #ifdef APP -->