Added minor style fixes; additional docstrings.
Added minor style fixes; additional docstrings.

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