Added intent to var_help.
Added intent to var_help.

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