feat: add owners file to docs&docs-cn

[purelind]

Close https://github.com/PingCAP-QE/ci/issues/2975

Changes to the CI related to docs & docs-cn require approval from members of the documentation team.

[ti-chi-bot[bot]]

I have already done a preliminary review for you, and I hope to help you do a better job.

Key Changes:

• Two new files have been added docs-cn/OWNERS and docs/OWNERS.
• These files contain the list of reviewers and approvers for the documentation related changes in the CI.

Potential Problems:

• No potential problems were identified in this pull request.

Fixing Suggestions:

• The pull request looks good as it is. However, it is suggested to add a brief description to the OWNERS file, describing its purpose and the roles of reviewers and approvers.
• It is also recommended to use a consistent format for the OWNERS file across all repositories and projects.

[purelind]

/cc @wuhuizuo

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-05-29 11:17:07.04116002 +0000 UTC m=+2861580.798295595: :ballot_box_with_check: agreed by wuhuizuo.

[wuhuizuo]

/hold

[wuhuizuo]

/approve cancel

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please ask for approval from purelind, ensuring that each of them provides their approval before proceeding. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files: - **[pipelines/OWNERS](https://github.com/PingCAP-QE/ci/blob/main/pipelines/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[wuhuizuo]

/close dup with #2976