feat: 添加 UseIntersectionObserverInfiniteLoading 组件的使用示例，优化模板结构 [no-ci]

src/components/UseIntersectionObserverInfiniteLoading.vue

@@ -17,6 +17,19 @@ function checkIsVisible(el: Element, root: Element | null = null) {
 </script>
 
 <script setup lang="ts">
+/**
+ * @example
+ *
+ * ```ts
+ * const list = ref<Record<string, never>[]>([]);
+ * const loadData = async (page: number) => { ... };
+ * ```
+ *
+ * ```vue
+ * <UseIntersectionObserverInfiniteLoading :async-load="loadData" ref="infiniteLoading" />
+ * ```
+ */
+
 const props = defineProps<{
   asyncLoad: (page: number) => Promise<{ hasMore: boolean }>;
 }>();