Notable changes:
- Removed the "disktype" argument from the -B only synopsis
form. This form doesn't touch the disk label, and doesn't
use this argument.
- Fixed the first example in the EXAMPLES section. Support
for compatibility slices has been recently dropped from
the GEOM kernels, and a bit later GEOM became standard.
- Removed the buggy notion from rev. 1.37 that disklabel(8)
may be used to define mount points; it cannot. Improve
some DOS partition / FreeBSD slice wording. Among these,
``dangerously-dedicated slice'' was just a nonsense. ;-)
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