Fix example for winnowing

src/traits/resolution.md

@@ -192,11 +192,15 @@ trait Get {
 }
 
 impl<T: Copy> Get for T {
-    fn get(&self) -> T { *self }
+    fn get(&self) -> T {
+        *self
+    }
 }
 
 impl<T: Get> Get for Box<T> {
-    fn get(&self) -> Box<T> { Box::new(get_it(&**self)) }
+    fn get(&self) -> Box<T> {
+        Box::new(<T>::get(self))
+    }
 }
 ```