test: fix doc tests

Author: yuxqiu

clippy_lints/src/methods/mod.rs

@@ -3736,11 +3736,15 @@ declare_clippy_lint! {
     ///
     /// ### Example
     /// ```no_run
+    /// # let option = Some(1);
+    /// # let result: Result<usize, ()> = Ok(1);
     /// option.map(|a| a > 10).unwrap_or_default();
     /// result.map(|a| a > 10).unwrap_or_default();
     /// ```
     /// Use instead:
     /// ```no_run
+    /// # let option = Some(1);
+    /// # let result: Result<usize, ()> = Ok(1);
     /// option.is_some_and(|a| a > 10);
     /// result.is_ok_and(|a| a > 10);
     /// ```