Docs show a deprecated option that results in an error ( `--db`)

[dveeden]

On https://tikv.org/docs/5.1/reference/cli/tikv-ctl/ the --db option is used a lot. However if I try to use this I get this:

error: Invalid value for '--db <db>': DEPRECATED!!! Use --data-dir and --config instead

I tried with v5.2.2 and v5.1.2 of tikv-ctl (via tiup)