i18n(ja): fix false-friend mistranslation of global statistics

[yahonda]

What is changed, added or deleted? (Required)

optimizer-fix-controls.md: "global" in "global statistics" (a specific TiDB statistics-collection concept, see statistics.md) was mistranslated as 世界 (world) instead of グローバル, producing 世界統計. Fixed to グローバル統計情報, matching the term already used consistently elsewhere in this corpus for the same concept.

Found via the live doc site: https://docs.pingcap.com/ja/tidb/stable/optimizer-fix-controls/

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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• optimizer-fix-controls.md

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