Minor style changes to docstrings.
Minor style changes to docstrings.

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