### _Why are the changes needed?_
### _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.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#2363 from deadwind4/flink-krb-doc.
Closes#2248
50f191fa [Ada Wang] [KYUUBI #2248][DOCS] Add a flink on yarn kerberos doc
Authored-by: Ada Wang <wang4luning@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>