i18n(ja): use English admonition labels so callouts render correctly

[yahonda]

What is changed, added or deleted? (Required)

The machine-translation pipeline left some callout (admonition) labels in Japanese: > **注記**, > **警告**, > **ヒント**. Unlike the English markers, these Japanese labels are not picked up as the localized callout box, so they render as plain bold text instead of the Note/Warning/Tip box.

This PR reverts those labels to the English form so the site renders and localizes them correctly, matching the English source at the same position — preserving each page's exact colon form (**Note:** / **Note** / **Note**:, etc.).

• 86 labels across 38 files (注記→Note, 警告→Warning, ヒント→Tip).
• Author templates under resources/doc-templates/ are intentionally left as-is (their labels carry （オプション） and are meta-instructions, not published content).

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

What is the related PR or file link(s)?

• This PR is translated from: N/A (Japanese-only rendering fix; no English source change)
• Other reference link(s): part of the ja i18n-ja-release-8.5 machine-translation cleanup series

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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