Correct a minor mistake in the code in lifetime-elision.md (#2814)

Author: JasonXJ

src/lifetimes/lifetime-elision.md

@@ -42,7 +42,7 @@ fn main() {
     let points = &[Point(1, 0), Point(1, 0), Point(-1, 0), Point(0, -1)];
     let nearest = {
         let query = Point(0, 2);
-        find_nearest(points, &Point(0, 2))
+        find_nearest(points, &query)
     };
     println!("{:?}", nearest);
 }