message: Auth doc: add example for configuring attributes
diff: @@ -217,6 +217,34 @@ auth.attachPermissionsForUnauthUsers([api, "s3"]);
  ### Advanced examples
  +#### Configuring attributes
  +
  +```js
  +import {
  + StringAttribute,
  + NumberAttribute,
  + BooleanAttribute,
  + DateTimeAttribute,
  +} from "aws-cdk-lib/aws-cognito";
  +
  +new Auth(this, "Auth", {
  + cdk: {
  + userPool: {
  + standardAttributes: {
  + fullname: { required: true, mutable: false },
  + address: { required: false, mutable: true },
  + },
  + customAttributes: {
  + 'gameId': new StringAttribute({ minLen: 5, maxLen: 15, mutable: false }),
  + 'participants': new NumberAttribute({ min: 1, max: 3, mutable: true }),
  + 'isCompleted': new BooleanAttribute({ mutable: true }),
  + 'startedAt': new DateTimeAttribute(),
  + },
  + }
  + },
  +});
  +```
  +
  #### Importing an existing User Pool
  Override the internally created CDK `UserPool` and `UserPoolClient` instance.
  