qmp: update send-key document commit 9f328977 changes qmp_send_key() to accept key codes in hex, but the document wasn't updated. The items of keys list is union now, not enum. Signed-off-by: Amos Kong <akong@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>