Updated example

Author: artem-v

config-examples/src/main/java/io/scalecube/config/examples/PredicateOrderingConfigExample.java

@@ -32,8 +32,9 @@ public static void main(String[] args) {
     ConfigRegistry configRegistry =
         ConfigRegistry.create(
             ConfigRegistrySettings.builder()
+                .addLastSource("sysProps", new SystemPropertiesConfigSource())
                 .addLastSource(
-                    "customSys",
+                    "customSysProps",
                     new SystemPropertiesConfigSource(new ClassPathConfigSource(customSysPredicate)))
                 .addLastSource(
                     "classpath",