Update lxc_create.c corrected argument usage example for -t

I think '-t timeout' was mistakenly written, so I corrected it to '-t
template', since the -t argument is used for setting templates, not
timeout as far as I know.

Signed-off-by: pc-wurm <yordanov@pc-wurm.de>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>