criu --help: improve --work-dir description
criu --help: improve --work-dir description

There should either be a comma before the second line, or it should be
in parenthesis. I chose latter.

Signed-off-by: Kir Kolyshkin <c0159612b0ef32139322233232df1a0d189c4b9b@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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