BF: reduce precision of doctest test using print
BF: reduce precision of doctest test using print

Use ``print`` to recude the significant digits printed (therefore
tested) in the doctest.

beni55/dipy,demianw/dipy,JohnGriffiths/dipy,maurozucchelli/dipy,sinkpoint/dipy,samuelstjean/dipy,StongeEtienne/dipy,samuelstjean/dipy,matthieudumont/dipy,maurozucchelli/dipy,FrancoisRheaultUS/dipy,StongeEtienne/dipy,villalonreina/dipy,FrancoisRheaultUS/dipy,demianw/dipy,oesteban/dipy,mdesco/dipy,jyeatman/dipy,matthieudumont/dipy,mdesco/dipy,maurozucchelli/dipy,jyeatman/dipy,rfdougherty/dipy,beni55/dipy,JohnGriffiths/dipy,nilgoyyou/dipy,nilgoyyou/dipy,villalonreina/dipy,rfdougherty/dipy,Messaoud-Boudjada/dipy,samuelstjean/dipy,Messaoud-Boudjada/dipy,oesteban/dipy,sinkpoint/dipy