i18n(ja): Fix TiDB Cloud mistranslations

[yahonda]

• TiDB クラウド -> TiDB Cloud

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[ti-chi-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 assign csuzhangxc for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

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

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[gemini-code-assist]

Code Review

This pull request standardizes the translation of "TiDB Cloud" in Japanese documentation by replacing "TiDB クラウド" with "TiDB Cloud". The review feedback suggests improving the phrasing of a translated list item in the 2021 release notes to make it sound more natural in Japanese, providing a ready-to-commit suggestion.