Update smsim-for-abm.Rmd
Update smsim-for-abm.Rmd

Looks great Robin, I've suggested some very minor changes
jojo-/spatial-microsim-book,modumont/spatial-microsim-book,majazaloznik/spatial-microsim-book,Robinlovelace/spatial-microsim-book,Robinlovelace/spatial-microsim-book,richardellison/spatial-microsim-book,modumont/spatial-microsim-book,Robinlovelace/spatial-microsim-book,emunozh/spatial-microsim-book,richardellison/spatial-microsim-book,modumont/spatial-microsim-book,emunozh/spatial-microsim-book,majazaloznik/spatial-microsim-book,jojo-/spatial-microsim-book