Update MainTestable.java

Author: klaeufer

src/main/java/edu/luc/cs/consoleapp/MainTestable.java

@@ -31,6 +31,7 @@ public static void main(final String[] args) {
 
     final var input = new Scanner(System.in).useDelimiter("(?U)[^\\p{Alpha}0-9']+");
     // a handler instance that sends updates to the console
+    // (the anonymous lambda implements the sole `accept` method)
     final OutputHandler outputToConsole =
       value -> {
         System.out.println(value);