monitor: Point to "help" command on syntax error
When a command fails due to incorrect syntax or input, suggest using the "help" command to get more information about the command. This is only applicable for HMP. Signed-off-by: NBandan Das <bsd@redhat.com> Acked-by: NLuiz Capitulino <lcapitulino@redhat.com> Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
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