docs(dynamodb): add note on replication limit

[peterwoodworth]

Adds note on limit of tables you can create with replication in the dynamodb README fixes: #22101

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[Naumel]

@Mergifyio update

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update

✅ Branch has been successfully updated

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
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