Update Exercises Directory Names to Reflect Order

exercises/22_clippy/clippy2.rs

@@ -0,0 +1,15 @@
+// clippy2.rs
+// 
+// Execute `rustlings hint clippy2` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+fn main() {
+    let mut res = 42;
+    let option = Some(12);
+    for x in option {
+        res += x;
+    }
+    println!("{}", res);
+}