[Toybox] [PATCH] ulimit: include descriptions and units.

[enh]

Also reorder the --help output to separate the "whats" from the "hows",
as with other commands that have lots of options, and add units to the
help too.
---
 toys/posix/ulimit.c | 47 ++++++++++++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 20 deletions(-)
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