fixes [#3430]

examples/three_parents_F2/README

@@ -19,7 +19,7 @@ $ spell-pedigree -wd spell/ -n demo -p example1.ped
 
 $ spell-marker -n demo -wd spell -m F2:A/B example1_F2.gen -m F2C:A/C example1_F2C.gen -o F2,F2C
 
-$ spell-qtl -n toto -wd spell -p F2 example1_F2.phen -p F2C example1_F2C.phen -gm example1.map -P auto QTL-detection CIM connected
+$ spell-qtl -n demo -wd spell -p F2 example1_F2.phen -p F2C example1_F2C.phen -gm example1.map -P auto QTL-detection CIM connected
 
 The connected parameter forces spell-qtl to consider A as the same ancestor in F2 and F2C. You can remove this parameter and see the difference in the final model.
 To output the 1-point Parental Origin Probabilities, add -O1 to the spell-marker commandline.