Fix example code

Author: rspencer01

clippy_lints/src/trivial_map_over_range.rs

@@ -24,7 +24,7 @@ declare_clippy_lint! {
     /// ```
     /// Use instead:
     /// ```no_run
-    /// let f : Vec<_> = std::iter::from_fn(|| { 3 + 1 }).take(10).collect();
+    /// let f : Vec<_> = std::iter::repeat_with(|| { 3 + 1 }).take(10).collect();
     /// ```
     #[clippy::version = "1.81.0"]
     pub TRIVIAL_MAP_OVER_RANGE,