update zh-cn/application-dev/IDL/idl-guidelines.md.

Signed-off-by: N葛亚芳 <geyafang@huawei.com>

zh-cn/application-dev/IDL/idl-guidelines.md

@@ -442,3 +442,9 @@ export default class MySequenceable {
     private str;
 }
 ```
+
+## 相关实例
+
+针对IDL的使用，有以下相关实例可供参考：
+
+- [Ability与ServiceExtensionAbility通信（ArkTS）(Full SDK)（API9）](https://gitee.com/openharmony/applications_app_samples/tree/OpenHarmony-3.2-Release/code/BasicFeature/IDL/AbilityConnectServiceExtension)
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