[PATCH] Minor mdconfig rc.d script tweaks and documentation improvements

[Garrett Cooper]

Hi RC folks,
    The following request resolves 2 PRs in the database which ask
that the mdconfig rc.d process be made more straightforward.
    If someone could review and commit this change (if they don't
object with it), I would appreciate it (as well as the submitters I'm
sure).
Thanks!
-Garrett

Add the ability to specify md(4) units when running the mdconfig rc scripts
and better document the overall process.

This allows folks to preconfigure units using a supported method that aren't
md0 and up, in the event that build infrastructure, etc can't be easily
changed to deal with device name collisions.

The enumeration process itself wasn't fully documented, so better
document what occurs when the script is executed.

PR:	conf/137470, docs/144537
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