[Feature][Style] Format docs automatically

[EricGao888]

Search before asking

• [X] I had searched in the issues and found no similar feature requirement.

Description

• Currently, Spotless in DS only formats java code automatically.
• Spotless does support formatting markdown, json... We could use it to format DS docs automatically.

https://github.com/diffplug/spotless

Use case

• Already described above.

Related issues

#6535

Are you willing to submit a PR?

• [X] Yes I am willing to submit a PR!

Code of Conduct

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

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