loader_simp.8: Clarify boot_serial

[ziaee]

Summary

Clarify what we have for now, that way when this is eventually
cleaned up we hopefully don't have to ask the same questions again.

This really needs to all be moved to loader.8 or loader.conf.8 or just
something centralized so everything points to that and people can search
just that instead of having to know about many different manuals and
search through them, or using man -K and grabbing a cup of coffee.

MFC after: immediately

[markmi_dsl-only.net]

"efi" vs. "eficom"? The limited contexts where comconsole should be used there days (does it presume x86/i368?)?

console can be a list in a first found order, as I understand. I've sometimes had to list 2 things but it was very picky about the order, not allowing one of the values to be first when multiple values were listed.

Things are not clear enough for me to do more than point you to asking Warner for suggestions about what is appropriate overall.

[ziaee]

Thanks Mark. With the time crunch I elected to increase the precision of the statement to answer one question, even though it doesn't answer all of them, as you said. I'm definitely interested in improving this more as SME availability increases!