:memo: Fix/Add config section of deployment on kubernetes

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

### Search before asking

- [X] I have searched in the [issues](https://github.com/apache/kyuubi/issues?q=is%3Aissue) and found no similar issues.

### What type of changes will we make to the documentation?

Typo, layout, grammar, spelling, punctuation errors, etc.

### Affects Version(s)

master

### Improving the documentation

The [kyuubi on kubernetes config section](https://kyuubi.readthedocs.io/en/master/deployment/kyuubi_on_kubernetes.html#config) states Kyuubi **do** not recommend using this way on Kubernetes. This can perhaps be stated as Kyuubi **does** not recommend using this way on Kubernetes.

### Are you willing to submit PR?

- [X] Yes. I would be willing to submit a PR with guidance from the Kyuubi community to improve.
- [ ] No. I cannot submit a PR at this time.

Open the linked Kyuubi on Kubernetes documentation and go to the config section. Correct the grammatical wording from “Kyuubi do not” to “Kyuubi does not,” then verify the rendered documentation preserves the intended meaning.

Written by the indexing model from the issue text.