### _Why are the changes needed?_
Fix the Markdown formatting for the table that demonstrates the difference between Kyuubi and HiveServer2.
The before table is as shown down below:

Document readability improvement.
Closes#4624 from DerickCypho/patch-1.
Closes#4624
4e9394a9c [Bowen Liang] Update docs/overview/kyuubi_vs_hive.md
a9935bfa2 [Bowen Liang] Update docs/overview/kyuubi_vs_hive.md
44c21e23e [Bowen Liang] Update docs/overview/kyuubi_vs_hive.md
776782590 [Bowen Liang] Update docs/overview/kyuubi_vs_hive.md
95b367e33 [DerickCypho] Fix table headers in kyuubi_vs_hive.md
6e42f9d8b [DerickCypho] Fix table headers for kyuubi_vs_hive.md
6684d2f46 [DerickCypho] Update kyuubi_vs_hive.md
Lead-authored-by: Derick Cypho <derickamaze@gmail.com>
Co-authored-by: Bowen Liang <bowenliang@apache.org>
Co-authored-by: DerickCypho <55829354+DerickCypho@users.noreply.github.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>