AutoMPGRegresion.java variables should not mention Iris

The AutoMPGRegression example was clearly a cut/paste/modify of the Iris example, but a few variable names did not get modified appropriately.  For what it is worth, I noticed this in the samples in https://s3.amazonaws.com/heatonresearch-books/free/encog-3_3-quickstart.pdf, but I'm not sure how that PDF is generated (I couldn't find it in the code repo).