Michael Wolfson writes:
> Tweaks and re-detailing.
> prep:   [...]
>         removed .Key tags, as they aren't recognized by groff
> 
> install: clean up the various exceptions between different versions of OF

whilst groff may not understand what ``.Key'' is, the install notes
most certainly should because it's macro define in ../common/macros,
along with many other macros used by macppc/{install,prep} such as
.(disp, .Ss2, etc.

i've added the .Key usage back in, and cleaned up a few other little
inconsistencies added (such as the use of .Nm instead of .Ic, etc).


also, you changed a line from:
	.Dl boot device[:partition][,filename] [kernel_location] [-as]
to
	.Dl boot device[:partition][,filename] [-as | kernel_location [-as]]
i'm not sure why: the first says that kernel_location is optional, and
so is -as as long as it's after. the second says the same thing but a
little more (unnecessarily IMHO) verbosely. or am i missing something?