Documentation: privateDnsZoneIdEventhubNamespace sample value is incorrect

[leinoaa]

Documentation Issue

The example value for privateDnsZoneIdEventhubNamespace is incorrect, now references synapse rather than servicesbus.

page: https://github.com/Azure/data-landing-zone/blob/main/docs/DataManagementAnalytics-AzureDevOpsDeployment.md#configure-paramsdevjson

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