Fixed doctest in Event class.
Fixed doctest in Event class.

ManuSchmi88/landlab,amandersillinois/landlab,landlab/landlab,Carralex/landlab,RondaStrauch/landlab,landlab/landlab,SiccarPoint/landlab,cmshobe/landlab,ManuSchmi88/landlab,ManuSchmi88/landlab,laijingtao/landlab,landlab/landlab,csherwood-usgs/landlab,SiccarPoint/landlab,cmshobe/landlab,amandersillinois/landlab,Carralex/landlab,RondaStrauch/landlab,cmshobe/landlab,laijingtao/landlab,Carralex/landlab,csherwood-usgs/landlab,RondaStrauch/landlab