Add an unusual-conversion example to to_uppercase
Add an unusual-conversion example to to_uppercase

Like how to_lowercase has ὈΔΥΣΣΕΎΣ.

aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust