i18n(ja): fix verb-sentence mistranslation of Limited SQL Features title

[yahonda]

What is changed, added or deleted? (Required)

"Limited SQL features on TiDB Cloud [Dedicated]" is a noun-phrase title, but was translated as a full verb sentence "TiDB Cloud [Dedicated]の SQL 機能が制限されている" ("TiDB Cloud['s] SQL features are restricted"), used both as a link text (92 occurrences in system-variable-reference.md) and as the document's own H1 heading (tidb-cloud/limited-sql-features.md).

Fixed to the noun-phrase form "TiDB Cloud [Dedicated]で制限されたSQL機能", matching the already-correct sibling renderings elsewhere in the corpus (TOC-tidb-cloud.md's "制限付き SQL 機能", serverless-limitations.md's "制限されたSQL機能", and limited-sql-features-tidb-x.md's own H1 "TiDB X インスタンスで制限される SQL 機能"). Anchor {#limited-sql-features-on-tidb-cloud-dedicated} unchanged; no inbound links reference the old heading text.

Known benign conflict: this PR and #23446 both touch system-variable-reference.md on adjacent lines within the same "See also" lists (non-overlapping content) — standard git context collision, trivial to resolve on rebase.

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

• v8.5 (LTS)
• v8.1 (LTS)
• v7.5 (LTS)
• v7.1 (LTS)
• v6.5 (LTS)
• v6.1 (LTS)

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Add redirect rules
• Change the framework or the code logic of the repository

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Timeline:

• 2026-08-05 12:30:17.266572069 +0000 UTC m=+2617603.302667125: ☑️ agreed by qiancai.