Update javadoc regarding exception handling in async clients

[zoewangg]

Motivation and Context

The exception returned by the SDK client is wrapped with CompletionException see below. We can't change it due to backwards compatibility reasons, so we are updating this doc to mention this behavior.

public static void main(String[] args) {
    var sqs = SqsAsyncClient.create();
    sqs.getQueueUrl(GetQueueUrlRequest.builder().queueName("invalidqueuename").build())
        .whenComplete((url, e) -> {
            System.out.println("Exception: " + e);
        })
        .join();
}

prints out

Exception: java.util.concurrent.CompletionException: software.amazon.awssdk.services.sqs.model.QueueDoesNotExistException: 
The specified queue does not exist for this wsdl version. (Service: Sqs, Status Code: 400, Request ID: xxxx)

Modifications

Update documentation

[sonarqubecloud]

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