Merchants zone setup

[christianepeters]

Issue
Please emphasize in the Data Domain and Asset Mapping written description that in the terraform setup the curated and data product are merged to one for Merchants and Credit Card Transaction Domain. (This is only a small fineprint in the domain structure diagram png and thus not searchable.)

Why is this a problem?
When trying to reuse the exact steps in Lab 3 for the Merchants Domain this will fail given the merged zones, so it's important to note that the terraform setup is different so one can correct for the initial setup.