fix(drag): 修改demo

src/sites/mobile-taro/vue/src/feedback/pages/drag/index.vue

@@ -5,11 +5,11 @@
     <nut-drag class="dragDemo">
       <nut-button type="primary">触摸移动</nut-button>
     </nut-drag>
-    <h2>x轴方向移动</h2>
+    <h2>y轴方向移动</h2>
     <nut-drag class="dragDemo" direction="y">
       <nut-button type="primary">Y轴移动</nut-button>
     </nut-drag>
-    <h2>y轴方向移动</h2>
+    <h2>x轴方向移动</h2>
     <nut-drag class="dragDemo" direction="x">
       <nut-button type="primary">X轴移动</nut-button>
     </nut-drag>