troubleshoot-tidb-cluster: fix TiDB error message text

[yahonda]

What is changed, added or deleted? (Required)

Found while reviewing a Japanese translation fix (CodeRabbit review on #23618): troubleshoot-tidb-cluster.md says the error message is InformationSchema is out of date (one word), but this doesn't match the actual TiDB error text.

Verified against ErrInfoSchemaExpired in pingcap/tidb:

https://github.com/pingcap/tidb/blob/1f9469913409f0c6bf4a946c51948ebdfc2d2bb8/pkg/errno/errname.go#L991

ErrInfoSchemaExpired: mysql.Message("Information schema is out of date: schema failed to update in 1 lease, please make sure TiDB can connect to TiKV", nil),

The correct text is Information schema is out of date (with a space between "Information" and "schema"), matching 7 other occurrences of this string elsewhere in this same docs corpus (faq/sql-faq.md, several releases/*.md files, tidb-troubleshooting-map.md). Only this one file had the wrong spelling.

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

• master

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

• Related: i18n(ja): keep literal TiDB error message text in English #23618 (CodeRabbit review comment that flagged this)

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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📥 Commits

Reviewing files that changed from the base of the PR and between a49788b and 6e40413.

📒 Files selected for processing (1)

• troubleshoot-tidb-cluster.md

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-09-03 04:22:34.759755393 +0000 UTC m=+1339589.930849506: ☑️ agreed by qiancai.

[qiancai]

/approve

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In response to a cherrypick label: base branch (master) needs to differ from target branch (master).