Update validation message

Author: alextwoods

codegen/src/main/java/software/amazon/awssdk/codegen/naming/DefaultNamingStrategy.java

@@ -507,9 +507,8 @@ private void validateCustomerVisibleName(String name, String location) {
                     ValidationErrorSeverity.DANGER,
                     String.format(
                         "Encountered a name or identifier that the customer will see (%s in the %s) with an underscore. "
-                        + "This isn't idiomatic in Java. Please either remove the underscores or apply the "
-                        + "'underscoresInNameBehavior' customization for this service (Supported "
-                        + "'underscoresInNameBehavior' values: %s).", name, location, supportedBehaviors)
+                        + "This isn't idiomatic in Java. Please either remove the underscores",
+                        name, location, supportedBehaviors)
                 ));
             }
             if (behavior != UnderscoresInNameBehavior.ALLOW) {