Expecting something that wasn't taught.

[Hisamera]

In the exercises/if/if1.rs there is a request for
"// Do not use:
// - return"
Coming from C++ I didn't know that Rust makes a distinction between expressions and statments, the comma problem hit me a little too early and made me lose like half an hour to figure how to do it without return. I propose to delete that "// - return" and leave the rest because it is quite heavliy explained in the "3.3 Functions" part of "the book". Everyone that is doing those exercises will notice that anyway.