docs(cognito): fix typo in cognito's README (#33874)

### Issue # (if applicable)

N/A

### Reason for this change

Due to incorrect spelling of `choice`.


### Description of changes



### Describe any new or updated permissions being added




### Description of how you validated changes



### Checklist
- [ ] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: yasuaki640

packages/aws-cdk-lib/aws-cognito/README.md

@@ -23,7 +23,7 @@ This module is part of the [AWS Cloud Development Kit](https://github.com/aws/aw
       - [Code Verification](#code-verification)
       - [Link Verification](#link-verification)
     - [Sign In](#sign-in)
-      - [Choise-based authentication](#choice-based-authentication-passwordless-sign-in--passkey-sign-in)
+      - [Choice-based authentication](#choice-based-authentication-passwordless-sign-in--passkey-sign-in)
     - [Attributes](#attributes)
     - [Attribute verification](#attribute-verification)
     - [Security](#security)