Update Functions.rmd

The paragraph following the code example says "returns the same value, '1'", so the print() isn't necessary or alternatively could change text to say "prints the same value, '1'".

There is a small issue with this example, because if I execute
j()
a <- matrix(1:9, nrow = 3)
j()
I actually do get something different. (Before running the example, I did have a value assigned for "a" in my global environment, which led to some head scratching). Don't see a way around this issue, though.