Update Exercises Directory Names to Reflect Order

exercises/22_clippy/README.md

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+# Clippy
+
+The Clippy tool is a collection of lints to analyze your code so you can catch common mistakes and improve your Rust code.
+
+If you used the installation script for Rustlings, Clippy should be already installed.
+If not you can install it manually via `rustup component add clippy`.
+
+## Further information
+
+- [GitHub Repository](https://github.com/rust-lang/rust-clippy).