message: memo: Add missing documentation for `validateAll` method
diff: @@ -18,6 +18,7 @@ The validator offers an API to add new fields and trigger validations.
  |---------|---------|---------|
  | attach(field: FieldOptions) | `Field` | attaches a new field to the validator. |
  | validate(descriptor?: String, value?: any, options?: Object) | `Promise<boolean>` | Validates the matching fields of the provided [descriptor](#field-descriptor). when validation is done, the Promise resolves a boolean indicating whether the selected was valid or not. |
  +| validateAll(fields?: String or Object) | `Promise<boolean>` | Validates each value against the corresponding field validations. |
  | pause() | `void` | Disables validation. |
  | resume() | `void` | Enables validation. |
  | detach(name: string, scope?: string) | `void` | Detaches the field that matches the name and the scope of the provided values. |
  