Fix typo

Author: phansch

clippy_dev/src/main.rs

@@ -22,7 +22,7 @@ fn main() {
                 .about("Makes sure that:\n \
                        * the lint count in README.md is correct\n \
                        * the changelog contains markdown link references at the bottom\n \
-                       * all lints groups include the correct lints\n \
+                       * all lint groups include the correct lints\n \
                        * lint modules in `clippy_lints/*` are visible in `src/lib.rs` via `pub mod`\n \
                        * all lints are registered in the lint store")
                 .arg(