Did King James have any words put into the book of Deuteronomy in the translation of the Bible?

I have been told that there is a letter held by the University of St. Andrews, Scotland from King James telling the translators to include words against witchcraft; this being a follow-on from the persecution of those people who were pagans or followers of the dark arts. As a Christian and a firm believer that the Bible is the true word of God, I find it difficult to believe that what I have been told is right. Therefore my question is this: Did King James ever tell those translating the Bible to include anything that was not in the original Hebrew OT or the Greek NT?