i18n(ja): keep TiDB Operator API resource names in English

[yahonda]

What is changed, added or deleted? (Required)

This PR keeps the TiDB Operator API resource names in English on the Japanese API overview page, where machine translation had translated the CRD kind names and jammed the product name.

api/tidb-operator-api-overview.md:

• Restore the canonical English CRD kind names in the resource list:
  • バックアップ → Backup
  • バックアップスケジュール → BackupSchedule
  • 復元する → Restore
  • Tidbクラスタ → TidbCluster
  • Tidbイニシャライザー → TidbInitializer
  • Tidbモニター → TidbMonitor
  • (DMCluster was already correct)
• Fix the jammed product name TiDB OperatorAPI → TiDB Operator API (heading, intro sentence, and the doc link). The heading anchor {#tidb-operator-api-overview} is explicit, so the visible-text change is anchor-safe.
• Add the missing particle after the documentation link (…docs.md)参照してください → …docs.md)を参照してください).

TOC-api.md and api/_index.md:

• TiDB OperatorAPI → TiDB Operator API.

These names match the English source (Backup, BackupSchedule, DMCluster, Restore, TidbCluster, TidbInitializer, TidbMonitor, and the TiDB Operator API product name) and the URL anchors they link to.

This change was split out of #23273 (missing particles after Markdown links) to keep that PR strictly to particle insertions.

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)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

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

• This PR is translated from: N/A (Japanese-only fix)
• Other reference link(s): split out of i18n(ja): add missing particle after Markdown links (wo before verbs, wa for subject) #23273

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

Summary by CodeRabbit

• Documentation
  • Standardized the “TiDB Operator API” naming across the API documentation.
  • Updated API list labels to consistent English terminology, including “Backup,” “Restore,” and “TidbCluster.”
  • Improved the API documentation reference link text without changing destination URLs.

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Timeline:

• 2026-07-29 14:13:22.445719225 +0000 UTC m=+2018988.481814281: ☑️ agreed by qiancai.