chore: add explanatory comment to clippy1
// The Clippy tool is a collection of lints to analyze your code
// so you can catch common mistakes and improve your Rust code.
//
+// For these exercises the code will fail to compile when there are clippy warnings
+// check clippy's suggestions from the output to solve the exercise.
// Execute `rustlings hint clippy1` for hints :)
// I AM NOT DONE
