Changed to document pet module, not class.
Changed to document pet module, not class.

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