typo

ch2.md

@@ -543,7 +543,7 @@ foos.stream()
 IntStream.range(1, 4)
     .mapToObj(i -> new Foo("Foo" + i))
     .peek(f -> IntStream.range(1, 4)
-        .mapToObj(i -> new Bar("Bar" + i + " <- " f.name))
+        .mapToObj(i -> new Bar("Bar" + i + " <- " + f.name))
         .forEach(f.bars::add))
     .flatMap(f -> f.bars.stream())
     .forEach(b -> System.out.println(b.name));