fix example

Author: Natural-selection1

library/core/src/result.rs

@@ -648,7 +648,7 @@ impl<T, E> Result<T, E> {
     /// let x: Result<u32, Error> = Ok(123);
     /// assert_eq!(x.is_err_and(|x| x.kind() == ErrorKind::NotFound), false);
     ///
-    /// let x: Result<u32, &str> = Err("ownership");
+    /// let x: Result<u32, String> = Err("ownership".to_string());
     /// assert_eq!(x.as_ref().is_err_and(|x| x.len() > 1), true);
     /// println!("still alive {:?}", x);
     /// ```