From: Chen Hanxiao <chenhanxiao(a)gmail.com>
In [1], <type> are described as "on_poweroff",
"on_reboot", "on_crash".
but we accept "poweroff", "reboot" and "crash".
This patch adds docs about them.
[1]:
https://libvirt.org/formatdomain.html#elementsEvents
Signed-off-by: Chen Hanxiao <chenhanxiao(a)gmail.com>
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