Replace off-topic parts of the desciption by an architecture overview

Remove useless (re)wording of what are audio(4) and midi(4), add a
quick description of sndiod as intermediate layer. Try to focuse on
what the sndio library and sndiod do instead of how they do it. As
suggested by schwarze, use the word "device descriptor" instead of
"device name" to avoid the common confusion with the device files.

ok and tweaks from jmc

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