docs: remove redundant references to official documentation in multiple tutorial README files

src/7-execsnoop/README.md

@@ -120,6 +120,4 @@ struct {
 
 This allows sending information directly to the user space.
 
-For more examples and detailed development guide, please refer to the official documentation of eunomia-bpf: [https://github.com/eunomia-bpf/eunomia-bpf](https://github.com/eunomia-bpf/eunomia-bpf).
-
 If you want to learn more about eBPF knowledge and practice, you can visit our tutorial code repository [https://github.com/eunomia-bpf/bpf-developer-tutorial](https://github.com/eunomia-bpf/bpf-developer-tutorial) to get more examples and complete tutorials."

src/7-execsnoop/README.zh.md

@@ -120,6 +120,4 @@ struct {
 
 就可以往用户态直接发送信息。
 
-更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档：<https://github.com/eunomia-bpf/eunomia-bpf>
-
 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 <https://github.com/eunomia-bpf/bpf-developer-tutorial> 或网站 <https://eunomia.dev/zh/tutorials/> 以获取更多示例和完整的教程。