chore(apigatewayv2): rephrased the documentation for HttpApiProps.disableExecuteApiEndpoint to make it more clearer. (#31734)

### Issue # (if applicable)

Closes #31729.

### Reason for this change
The current documentation for `disableExecuteApiEndpoint` at [HttpApi](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_apigatewayv2.HttpApi.html#disableexecuteapiendpoint) is confusing. It states that:
```
Type: boolean (optional, default: false execute-api endpoint enabled.)

Specifies whether clients can invoke your API using the default endpoint.

By default, clients can invoke your API with the default https://{api_id}.execute-api.{region}.amazonaws.com endpoint. Enable this if you would like clients to use your custom domain name.
```

### Description of changes
Rephrased the documentation for `HttpApiProps.disableExecuteApiEndpoint` to make it more clearer.

Refer documentation for`DisableExecuteApiEndpoint` at [AWS::ApiGatewayV2::Api](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-apigatewayv2-api.html#cfn-apigatewayv2-api-disableexecuteapiendpoint).

### Description of how you validated changes
N/A

### Checklist
- [x] 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)

----

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

Author: ashishdhingra

packages/aws-cdk-lib/aws-apigatewayv2/lib/http/api.ts

@@ -140,8 +140,8 @@ export interface HttpApiProps {
   /**
    * Specifies whether clients can invoke your API using the default endpoint.
    * By default, clients can invoke your API with the default
-   * `https://{api_id}.execute-api.{region}.amazonaws.com` endpoint. Enable
-   * this if you would like clients to use your custom domain name.
+   * `https://{api_id}.execute-api.{region}.amazonaws.com` endpoint. Set this to
+   * true if you would like clients to use your custom domain name.
    * @default false execute-api endpoint enabled.
    */
   readonly disableExecuteApiEndpoint?: boolean;