docs(lambda-event-sources): remove incorrect description regarding receiveMessageWaitTime

[tam0ri]

Currently, the document for aws_lambda_event_sources module includes the following description.
https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda_event_sources-readme.html#sqs

receiveMessageWaitTime: Will determine long poll duration. The default value is 20 seconds.

However, from SQS perspective, the default value is 0. So, the above description is incorrect.
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_SetQueueAttributes.html

ReceiveMessageWaitTimeSeconds – The length of time, in seconds, for which a ReceiveMessage action waits for a message to arrive. Valid values: An integer from 0 to 20 (seconds). Default: 0.

Also, when we use SQS queue as Lambda's source, Lambda uses long polling regardless of the queue's ReceiveMessageWaitTimeSeconds setting.
https://docs.aws.amazon.com/lambda/latest/dg/with-sqs.html#events-sqs-scaling

For standard queues, Lambda uses long polling to poll a queue until it becomes active.

So, in this context, receiveMessageWaitTime prop for Queue construct does not affect the behavior of Lambda EventSource. To avoid confusion, this PR remove the description regarding receiveMessageWaitTime from document.

Closes #24795

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