update markdown format

Signed-off-by: N周鹏飞@yunify <pengfeizhou@yunify.com>

docs/powered-by-kubesphere.md

@@ -5,7 +5,7 @@ or providing commercial products including KubeSphere.
 
 You can open a Pull Request to submit your institution name and homepage if you are using KubeSphere. Thus we can better understand the user's scenarios and further improve project.
 
-- 本来生活 https://www.benlai.com/
-- 新浪 https://sina.cn/
+- [本来生活](https://www.benlai.com/)
+- [新浪](https://sina.cn/)
 - 方正株式（武汉）科技开发有限公司
 - 武汉麦尔沃克信息技术