Fix mistake: indefinite -> discard immediately
Fix mistake: indefinite -> discard immediately

ActionQueueTimeoutEnqueue 0 means "discard immediately" and not "indefinite".
For the reference: http://www.rsyslog.com/doc/v8-stable/concepts/queues.html#filled-up-queues
janmejay/rsyslog-doc,qha/rsyslog-doc,janmejay/rsyslog-doc,janmejay/rsyslog-doc,janmejay/rsyslog-doc,qha/rsyslog-doc,sematext/rsyslog-doc,sematext/rsyslog-doc,sematext/rsyslog-doc,qha/rsyslog-doc,sematext/rsyslog-doc,qha/rsyslog-doc