Fixed whitespace in doctest.
Fixed whitespace in doctest.

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