Update validate-addresses.md

Author: sushithegreat

docs/validate-addresses.md

@@ -38,7 +38,7 @@ public class ShipEngineDemo {
 
         List<Map<String, String>> unvalidatedAddress = List.of(stubAddress);
 
-        Map<String, String> result = shipengine.validateAddresses(unvalidatedAddress);
+        List<Map<String, String>> result = shipengine.validateAddresses(unvalidatedAddress);
         System.out.println("result = " + result);
     }
 } 
@@ -94,4 +94,4 @@ Exceptions
 ----------
 
 - This method will only throw an exception that is an instance/extension of **ShipEngineException** if there is a
-  problem if a problem occurs, such as a network error or an error response from the API.
+  problem if a problem occurs, such as a network error or an error response from the API.