i18n(ja): fix the mistranslated link text for "Statement Summary Tables"

[yahonda]

What is changed, added or deleted? (Required)

The link text 明細書要約表 for /statement-summary-tables.md is a mistranslation of "Statement Summary Tables". 明細書 means a billing/itemized statement and is unrelated to the SQL "statement" (SQL文/ステートメント).

Corrected to ステートメントサマリーテーブル, which:

• is already the established term in the ja docs (60 occurrences), and
• is used in the surrounding body text of the same sentences (so the current pages are internally inconsistent).

Only the link text changes; the /statement-summary-tables.md link targets are unchanged. 4 occurrences in 3 files: functions-and-operators/tidb-functions.md (2), releases/release-7.5.1.md (1), sql-plan-management.md (1).

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

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)

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

N/A — terminology fix on the ja translation branch.

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