docs: update the examples readme

examples/complete/README.md

@@ -11,6 +11,6 @@ atlantis_gh_user               = "your-github-username"
 atlantis_repo_allowlist        = ["repo1", "repo2"]
 
 # Optional Parameters
-thumbprint_list                = ["your-thumbprint-1", "your-thumbprint-2"]
+thumbprint_list                = ["oidc-thumbprint-1", "oidc-thumbprint-2"]
 atlantis_docker_image          = "your-docker-image"
 ```