fix: radio的demo调整 (#525)

* fix: radio的demo调整

src/packages/__VUE/radio/demo.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="demo">
+  <div class="demo demo-nut-radio">
     <nut-cell-group title="基本用法-左右侧">
       <nut-cell>
         <nut-radiogroup v-model="radioVal" @change="handleChange1">
@@ -111,4 +111,9 @@ export default createDemo({
 .demo-check {
   margin-right: 10px;
 }
+.demo-nut-radio {
+  .nut-radio {
+    margin-bottom: 8px;
+  }
+}
 </style>

src/sites/mobile-taro/vue/src/base/pages/radio/index.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="demo">
+  <div class="demo demo-nut-radio">
     <nut-cell-group title="基本用法-左右侧">
       <nut-cell>
         <nut-radiogroup v-model="radioVal" @change="handleChange1">
@@ -108,4 +108,9 @@ export default {
 .demo-check {
   margin-right: 10px;
 }
+.demo-nut-radio {
+  .nut-radio {
+    margin-bottom: 8px;
+  }
+}
 </style>