docs: sync keywords from TiDB parser

[pingcap-docs-app]

Automated keyword documentation sync generated from TiDB parser changes.

Parser source: pkg/parser/parser.y

Source TiDB commit

• b254c43931d9: *: parser support for MySQL dual passwords (RETAIN CURRENT PASSWORD / DISCARD OLD PASSWORD) (#68028), #68028 @takaidohigasi

Do not commit manual edits to this branch. It is regenerated by keyword sync.

[ti-chi-bot]

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[ti-chi-bot]

Hi @pingcap-docs-app[bot]. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[pingcap-docs-app]

/cc @takaidohigasi

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[Oreoxmt]

@terry1purcell Could you please help review the documentation updates related to the addition of the RETAIN and OLD keywords? The corresponding code changes are in pingcap/tidb#68028

[Oreoxmt]

/ok-to-test