i18n(ja): standardize exchange partition terminology

[yahonda]

What is changed, added or deleted? (Required)

Standardize the Japanese translation of "exchange partition" / "partition exchange".

Consistency rules:

• Feature/concept name: パーティション交換 (compound noun, matching existing patterns like パーティション管理/パーティション選択)
• SQL command EXCHANGE PARTITION: not translated (kept as-is)

Changes (3 files):

File	Before	After
releases/release-6.3.0.md	交換パーティションが GA	パーティション交換が GA
releases/release-7.5.6.md	交換パーティションの誤った判断	パーティション交換の誤った判断
releases/release-8.5.2.md	交換パーティションでの誤った判断	パーティション交換での誤った判断

Unchanged (verified not applicable):

• EXCHANGE PARTITION (SQL command): kept as-is ✓
• MPP ハッシュパーティション交換演算子 (MPP Exchange operator, different concept): not changed ✓
• パーティション交換 (already correct in global-indexes.md, release-6.5.6.md, release-7.1.2.md, release-7.4.0.md): not changed ✓

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 terminology consistency fix)
• Other reference link(s):

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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[gemini-code-assist]

Code Review

This pull request standardizes the Japanese translation of "partition exchange" by changing "交換パーティション" to "パーティション交換" across multiple release notes (v6.3.0, v7.5.6, and v8.5.2). The reviewer suggested a minor phrasing adjustment in release-7.5.6.md to use "での誤った判断" instead of "の誤った判断" for consistency with other release notes, along with formatting corrections for issue numbers and user mentions.

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