i18n(ja): fix two translation defects in the v7.5.4 and v7.5.6 release notes

[yahonda]

What is changed, added or deleted? (Required)

Fixes two translation defects in the Japanese v7.5.x release notes. These lines were found in the releases review but held back from #24154 because they are adjacent to lines changed in #24151. Both PRs are now merged.

• releases/release-7.5.6.md: the Bit type was moved to the end of the sentence. It now appears with Enum and Set, matching EN: "When the parameter is of Enum, Bit, or Set type, the Conv() function is no longer pushed down to TiKV".
• releases/release-7.5.4.md: "any" was missing in "between TiFlash and any PD". The fix adds 任意の.

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• 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): i18n(ja): use one rendering for the disaggregated and coupled TiFlash architectures #24151, i18n(ja): fix translation defects in the v7.5.x and v7.6.0 release notes #24154

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

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Clarified that a network partition between TiFlash and any PD can cause read-request timeouts.
  • Specified that Bit, like Enum and Set, is not eligible for Conv() pushdown.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: pingcap/docs/.coderabbit.yaml
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: 0ef9be76-34c1-4f2f-b0c9-b943095d36c6

📥 Commits

Reviewing files that changed from the base of the PR and between c070372 and bd69dfe.

📒 Files selected for processing (2)

• releases/release-7.5.4.md
• releases/release-7.5.6.md

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

Two release notes clarify the PD connection associated with a TiFlash timeout and add Bit to the Conv() parameter types that are not pushed down to TiKV.

Changes

TiFlash network-partition note

Layer / File(s)	Summary
Clarify affected PD connection releases/release-7.5.4.md	The note specifies that a network partition between TiFlash and any PD can cause read-request timeouts.

Conv pushdown note

Layer / File(s)	Summary
Update excluded parameter types releases/release-7.5.6.md	The note adds Bit to Enum and Set as parameter types that are not pushed down to TiKV.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to bd69d

The notes accurately describe the affected PD connections and the Bit pushdown limitation. No material PR-introduced risk remains before normal checks.

Architecture Summary

Architecture risk: 🔵 Low · up to bd69d

The change affects 1 system.

Changed systems: releases

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — releases (service) was modified; 2 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in releases/release-7.5.4.md: The TiFlash network-partition issue description now identifies the affected connection as one between TiFlash and any PD; the prior description did not specify “any.”
• observed — Modified behavior in releases/release-7.5.6.md: Conv() が TiKV にプッシュダウンされなくなる型として、従来の Enum と Set に Bit を追加しました。

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the two Japanese translation fixes and the affected v7.5.4 and v7.5.6 release notes.
Description check	✅ Passed	The description explains both changes, identifies the target documentation branch, references related pull requests, and records AI involvement. It satisfies the required template sections.
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.

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