message: Adjust message about deprecated rule group props
diff: export const errorDeprecatedRuleGroupProps =
  'A custom RuleGroup component has rendered a standard RuleGroup ' +
  - 'component with deprecated props. The rules, not, and combinator ' +
  + 'component with deprecated props. The combinator, not, and rules ' +
  'props should not be used. Instead, the full group object should ' +
  'be passed as the ruleGroup prop.';
  