message: docs: use `ValidationErrors` interface in Form validation examples
  PR Close
diff: @@ -5,7 +5,7 @@ import { AbstractControl, NG_VALIDATORS, ValidationErrors, Validator, ValidatorF
  // #docregion custom-validator
  /** A hero's name can't match the given regular expression */
  export function forbiddenNameValidator(nameRe: RegExp): ValidatorFn {
  - return (control: AbstractControl): {[key: string]: any} | null => {
  + return (control: AbstractControl): ValidationErrors | null => {
  const forbidden = nameRe.test(control.value);
  return forbidden ? {forbiddenName: {value: control.value}} : null;
  };
  