i18n(ja): fix noun-smashed translation of a TiCDC release-note bullet

[yahonda]

What is changed, added or deleted? (Required)

releases/release-6.0.0-dmr.md: EN "Support placement rules" (a verb-initial release-note bullet) had been word-for-word reordered into a bare noun compound with no particle, reading as a smashed-together "Support-Placement-Rule" noun rather than a sentence. Reworded to the noun-ending form used by sibling bullets in the same list.

1 file changed, 1 site.

Note: a broader corpus-wide sweep found ~50 similar "Support X" release-note bullets across ~30 files (mostly older release notes, release-1.0 through release-7.x) with the same word-order issue — this PR fixes only the single site the user flagged; the rest are tracked separately for a future dedicated sweep since each needs individual EN verification.

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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[yahonda]

Consolidated into #23651, which covers the same defect class (noun-smashed "Support X" release-note bullets) across the whole corpus, including this file's site.