InsertionDeletionBST.java solution changes the content of the node

[piyushmh]

epibook.github.io/solutions/java/src/main/java/com/epi/InsertionDeletionBST.java

Line 75 in 3d15ced

keyNode.data = rKeyNode.data;

This line copies the content of the minimum node found in the subtree into the node to be deleted, whereas it's mentioned in the question (C++ version of the book) that "You cannot change the contents of any node".