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### _Why are the changes needed?_
<!--
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Make Kyuubi SQL extension readable.
### _How was this patch tested?_
The screen snapshot is:
Closes#702 from ulysses-you/docs.
Closes#699
d9d63604 [ulysses-you] nit
21d9cf75 [ulysses-you] docs
b034421d [ulysses-you] docs
Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: ulysses-you <ulyssesyou18@gmail.com>
2a05326c1b
