Document the existence of machdep.guessed_bootdev, as suggested by Sheldon. For a detailed description look at the commit log for sysctl.c rev.1.42 -- i do not think it is appropriate to put the full description in this manpage, and the "boot" and "loader" manpages where this description might go are also missing a description of a number of similar variables, so i think this it is ok to limit documentation to this now, and update it later when I (or someone else) have a chance to revise "boot" and "loader".
Document the existence of machdep.guessed_bootdev, as suggested
by Sheldon.
For a detailed description look at the commit log for sysctl.c
rev.1.42 -- i do not think it is appropriate to put the full
description in this manpage, and the "boot" and "loader" manpages
where this description might go are also missing a description of
a number of similar variables, so i think this it is ok to limit
documentation to this now, and update it later when I (or someone
else) have a chance to revise "boot" and "loader".

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