feat: txn limit shift to 1TB

[Icemap]

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[Icemap]

/cc @Oreoxmt

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[dveeden]

What about the other pages that mention txn-total-size?

$ git grep -l txn-total-size
develop/dev-guide-delete-data.md
develop/dev-guide-transaction-restraints.md
develop/dev-guide-update-data.md
faq/migration-tidb-faq.md
maintain-tidb-using-tiup.md
releases/release-4.0.0-beta.1.md
releases/release-4.0.0-rc.2.md
releases/release-6.5.0.md
sql-statements/sql-statement-load-data.md
system-variables.md
tidb-configuration-file.md
tiflash/tiflash-results-materialization.md
transaction-overview.md

[qiancai]

Removed the needs-cherry-pick-release-7.3 label because the v7.3 docs have been archived at https://docs-archive.pingcap.com/tidb/v7.3 and will no longer receive new updates.

[qiancai]

Removed the needs-cherry-pick-release-7.4 label because the v7.4 docs have been archived at https://docs-archive.pingcap.com/tidb/v7.4 and will no longer receive new updates.

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[ti-chi-bot[bot]]

PR needs rebase.

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