### _Why are the changes needed?_
Add content to kyuubi_on_kubernetes.md about deploying kyuubi on k8s
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [X] [Run test](https://kyuubi.readthedocs.io/en/latest/tools/testing.html#running-tests) locally before make a pull request
Closes#656 from zwangsheng/doc/kubernetes.
Closes#656
7db333e [Binjie Yang] change words
b50de5d [Binjie Yang] Canonical format
9659c28 [Binjie Yang] change configurations about volumes
1e76475 [Binjie Yang] Adjust chapter order
a666522 [Binjie Yang] do some change to both kubernetes and yarn doc
23b30b1 [Binjie Yang] lowcase kubectl
754d43b [Binjie Yang] change some bug
f2debf6 [Binjie Yang] add on_kubernetes.md
Authored-by: Binjie Yang <2213335496@qq.com>
Signed-off-by: Kent Yao <yao@apache.org>
5b7598c533