i18n(ja): fix dropped particles and word-order scramble in best-practices docs

[yahonda]

What is changed, added or deleted? (Required)

Fixes dropped particles and word-order scrambles found while sweeping best-practices docs for the same defect class found in performance-tuning-practices.md/methods.md: missing が/は/を particles immediately after backtick-quoted identifiers, and a missing enumeration item (three dimensions collapsed into a malformed fragment).

• best-practices/grafana-monitor-best-practices.md: "three dimensions (instance, job and type)" had lost the "three dimensions" count and enumeration commas entirely.
• best-practices/multi-column-index-best-practices.md: 2 sites, missing が before comparison verbs (a1が1より大きい/小さい).
• best-practices/uuid.md: missing は before a UUID_TO_BIN usage clause, and missing を before 明示的に設定する.

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

• i18n-ja-release-8.5 (TiDB Japanese documentation for TiDB 8.5 versions)

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

• This PR is translated from:
• Other reference link(s):

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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📥 Commits

Reviewing files that changed from the base of the PR and between a8066cf and 793eed8.

📒 Files selected for processing (2)

• best-practices/grafana-monitor-best-practices.md
• best-practices/uuid.md

📝 Walkthrough

Walkthrough

The change corrects Japanese wording in three best-practices documents. It updates a figure description, two grammar errors, and UUID documentation wording, punctuation, and linking.

Changes

Japanese documentation corrections

Layer / File(s)	Summary
Best-practices wording corrections best-practices/grafana-monitor-best-practices.md, best-practices/multi-column-index-best-practices.md, best-practices/uuid.md	Corrected the Grafana figure description, added missing Japanese particles in the multi-column index example, and updated UUID wording, punctuation, and the CLUSTERED option link. No technical behavior or procedure changed.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Severity of issue fixed: Low

Merge Risk: 🔵 Low · up to a8066

The documentation changes correct Japanese wording, but the UUID example still describes the two insertions inconsistently, which may reduce clarity for readers. No runtime behavior or procedures are affected.

Suggested reviewers: qiancai

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies Japanese localization fixes for dropped particles and word-order issues in the best-practices documentation.
Description check	✅ Passed	The description explains all changed files and required documentation corrections. It includes the affected version, AI involvement, reference-link section, and applicability checklist. The first-time…

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between a2da298 and a8066cf.

📒 Files selected for processing (3)

• best-practices/grafana-monitor-best-practices.md
• best-practices/multi-column-index-best-practices.md
• best-practices/uuid.md

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