[TASK][EASY] Kyuubi documentation improvements

[pan3793]

Code of Conduct

• I agree to follow this project's Code of Conduct

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Mentor

• I have sufficient knowledge and experience of this task, and I volunteer to be the mentor of this task to guide contributors to complete the task.

Skill requirements

• Basic knowledge of Apache Kyuubi
• Good English tech article writing skills

Background and Goals

This is kind of an umbrella task, anyone who can improve the Kyuubi docs by sending PRs directly, for example

• fix typos or grammar issues
• polish the expressions or statements
• write articles to introduce how to integrate Kyuubi with other popular projects or services
• write articles to introduce the user case
• ...

Implementation steps

The maintainers/committers would classify your PR into different levels based on the content of certain PRs, e.g.

"fix typos or grammar issues" is generally a TRIVIAL task.

"write articles to introduce how to integrate Kyuubi with some AWS services" could be an EASY or MEDIUM task

Additional context

Introduction of #6232