chore(dynamodb): update waitForReplicationToFinish flag summary doc to highlight that it may cause deletion for existing replicas.

[moelasmar]

Description of changes

Add a warning message to the summary doc of the flag waitForReplicationToFinish to highlight that misusing this flag may cause deletion for existing replicas. This change is required to resolve some internal feedback as some people may miss reading the detail documentation of that flag, and so they will may misuse it and then have some serious issues.

Description of how you validated changes

see the below image for the updated doc:

Checklist

• [X] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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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

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 5aa93de02b13a42d919860da5ed4084d95909791
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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