Update record component accessors to appropriate variable name (#65)

Author: DainTrain

src/records/return_multiple_values.md

@@ -16,13 +16,13 @@ void main() {
     Location treasureIsland = findTreasureIsland();
     System.out.println(
         "Treasure island is located at " +
-            location.latitude() +
+            treasureIsland.latitude() +
             " " +
-            location.longitude() +
+            treasureIsland.longitude() +
             "."
     );
 }
 ```
 
 Regular classes are, of course, still useful. Its just for classes which only
-hold some data together (and nothing else interesting) getting a constructor and accessors automatically is very convenient.
+hold some data together (and nothing else interesting) getting a constructor and accessors automatically is very convenient.