Fix a minor bug in some sample code in a Javadoc.
Fixes
@@ -39,7 +39,7 @@ public final class FieldScopes {
* // Fails, because actual.getBaz() != expected.getBaz().
* assertThat(actual).isEqualTo(expected);
*
- * Foo scope = Foo.newBuilder().setBar(2);
+ * Foo scope = Foo.newBuilder().setBar(2).build();
* // Succeeds, because only the field 'bar' is compared.
* assertThat(actual).withPartialScope(FieldScopes.fromSetFields(scope)).isEqualTo(expected);
*
