RF: updated examples_index.rst
RF: updated examples_index.rst

nilgoyyou/dipy,matthieudumont/dipy,FrancoisRheaultUS/dipy,matthieudumont/dipy,villalonreina/dipy,nilgoyyou/dipy,StongeEtienne/dipy,StongeEtienne/dipy,FrancoisRheaultUS/dipy,villalonreina/dipy