Wrong namespace in example/k8s_auth/vault-tokenreview-binding.yaml

[ak1394]

It looks like the namespace on line 13 of vault-tokenreview-binding.yaml should be "default" instead of "vault-services". I have followed the documentation steps to deploy vault-operator and configure k8s auth, but failed to authenticate. Changing namespace has resolved the issue.

[leitmedium]

I can confirm the issue and was also able to fix it by setting the namespace to "default". I created a pull request for the fix: #368