Incorrect placeholder of the code repository on the project setting page

Created by: LinuxSuRen

Describe the bug As I mentioned in the titile.

/area devops Versions used(KubeSphere/Kubernetes) KubeSphere: v3.3.0-alpha.0

Environment This is not an environmental issue.

To Reproduce Steps to reproduce the behavior:

1. Go to DevOps project
2. Go to the prjoect setting page
3. Add a new repo
4. See errors

Expected behavior Have a correct placeholder.