STY: changed argument name from `iter` to `it`
STY: changed argument name from `iter` to `it`

This avoids conflict with the python builtin `iter`
dingliumath/quant-econ,mgahsan/QuantEcon.py,agutieda/QuantEcon.py,agutieda/QuantEcon.py,andybrnr/QuantEcon.py,gxxjjj/QuantEcon.py,andybrnr/QuantEcon.py,jviada/QuantEcon.py,jviada/QuantEcon.py,gxxjjj/QuantEcon.py,oyamad/QuantEcon.py,QuantEcon/QuantEcon.py,QuantEcon/QuantEcon.py,oyamad/QuantEcon.py,dingliumath/quant-econ,mgahsan/QuantEcon.py