### _Why are the changes needed?_
- as pyspark is supported in #3780, exposing PYTHON option for `kyuubi.operation.language` as an experimental feature
### _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
- [ ] [Run test](https://kyuubi.readthedocs.io/en/master/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#4256 from bowenliang123/doc-language-python.
Closes#4256
d10c0281 [liangbowen] update description
d05cedda [liangbowen] add PYTHON option in kyuubi.operation.language
Authored-by: liangbowen <liangbowen@gf.com.cn>
Signed-off-by: liangbowen <liangbowen@gf.com.cn>