Change the depricated functions TOINT() and UPPER() to toInteger() and toUpper()

[vedhav]

The tutorial on "Using LOAD CSV in the Real World" was very informative even though it was made back in 2015. As more and more people start learning Neo4j, I think they would try to follow this example to import csv into graph. But the TOINT and UPPER functions were depricated long back and it would be great if they were replaced with their new counterparts so people could follow this example with ease.