Re: Better help output for pgbench -I init_steps

On 2023-Jul-12, Gurjeet Singh wrote:

> The init-steps are severely under-documented in pgbench --help output.
> I think at least a pointer to the the pgbench docs should be mentioned
> in the pgbench --help output; an average user may not rush to read the
> code to find the explanation, but a hint to where to find more details
> about what the letters in --init-steps mean, would save them a lot of
> time.

Agreed.

I would do it the way `pg_waldump --rmgr=list` or `psql
--help=variables` are handled: they give you a list of what is
supported. You don't have to put the list in the main --help output.

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