message: docs(forms): add text about min() and max() as functions
  PR Close
diff: @@ -75,6 +75,8 @@ const EMAIL_REGEXP =
  export class Validators {
  /**
  * Validator that requires controls to have a value greater than a number.
  + *`min()` exists only as a function, not as a directive. For example,
  + * `control = new FormControl('', Validators.min(3));`.
  */
  static min(min: number): ValidatorFn {
  return (control: AbstractControl): ValidationErrors | null => {
  @@ -90,6 +92,8 @@ export class Validators {
  /**
  * Validator that requires controls to have a value less than a number.
  + * `max()` exists only as a function, not as a directive. For example,
  + * `control = new FormControl('', Validators.max(15));`.
  */
  static max(max: number): ValidatorFn {
  return (control: AbstractControl): ValidationErrors | null => {
  