### _Why are the changes needed?_
Remove unused deployment documents of Spark.
### _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#2242 from KenjiFujima/KYUUBI-2241.
Closes#2241
b9264590 [KenjiFujima] [KYUUBI #2241] Remove unused deployment documents of Spark
Authored-by: KenjiFujima <thanosxnicholas@gmail.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>