style: revise description part

app/src/components/game/DescriptionPart.vue

@@ -37,7 +37,7 @@ const right = () => {
         :icon="['far', 'lightbulb']"
         class="text-yellow-200 p-2 content-center"
       />
-      <h1 class="inline text-text w-1/2 font-xl p-2 m-1">說明 {{ length }}</h1>
+      <h1 class="inline text-text w-1/2 font-xl p-2 m-1">說明</h1>
       <div v-if="current !== -1" class="flex w-full justify-end items-end">
         <button
           class="p-2 m-1 w-1/8"