Update structured_grid.py
Update structured_grid.py

Nicole fixing her mistakes
ManuSchmi88/landlab,ManuSchmi88/landlab,SiccarPoint/landlab,Carralex/landlab,amandersillinois/landlab,laijingtao/landlab,SiccarPoint/landlab,landlab/landlab,cmshobe/landlab,decvalts/landlab,RondaStrauch/landlab,landlab/landlab,csherwood-usgs/landlab,cmshobe/landlab,cmshobe/landlab,RondaStrauch/landlab,ManuSchmi88/landlab,csherwood-usgs/landlab,landlab/landlab,Carralex/landlab,Carralex/landlab,RondaStrauch/landlab,decvalts/landlab,amandersillinois/landlab,laijingtao/landlab