Chore: Set in capitalize the Count in example #1115

#1115

src/guide/built-ins/keep-alive-demos/CompA.vue

@@ -5,6 +5,6 @@ const count = ref(0)
 
 <template>
  <p>Current component: A</p>
- <span style="margin-right: 20px">count: {{ count }}</span>
+ <span style="margin-right: 20px">Count: {{ count }}</span>
  <button @click="count++">+</button>
 </template>