fix example code

Author: Jacherr

clippy_lints/src/zero_repeat_side_effects.rs

@@ -21,15 +21,15 @@ declare_clippy_lint! {
     ///
     /// ### Example
     /// ```no_run
-    /// fn side_effect(): i32 {
+    /// fn side_effect() -> i32 {
     ///     println!("side effect");
     ///     10
     /// }
     /// let a = [side_effect(); 0];
     /// ```
     /// Use instead:
     /// ```no_run
-    /// fn side_effect(): i32 {
+    /// fn side_effect() -> i32 {
     ///     println!("side effect");
     ///     10
     /// }