Fix tidy violation

Author: Vitali Lovich

src/libstd/sync/condvar.rs

@@ -466,9 +466,11 @@ impl Condvar {
     ///
     /// // wait for the thread to start up
     /// let &(ref lock, ref cvar) = &*pair;
-    /// let result = cvar.wait_timeout_until(lock.lock().unwrap(), Duration::from_millis(100), |started| {
-    ///     *started
-    /// }).unwrap();
+    /// let result = cvar.wait_timeout_until(
+    ///     lock.lock().unwrap(),
+    ///     Duration::from_millis(100),
+    ///     |started| started,
+    /// ).unwrap();
     /// if result.1.timed_out() {
     ///     // timed-out without the condition ever evaluating to true.
     /// }