infrastructureEncryptionEnabled seems to be set to false by default

[robertwe]

If you would like to create a Postgres instance on Azure you can specify flag called infrastructureEncryptionEnabled. I have tried already few times to use it but looks like it simply does not work. Provided documentation says it can be set to true. What is interesting Terraform Azure provider (azurerm) got it well documented. https://www.terraform.io/docs/providers/azurerm/r/postgresql_server.html#infrastructure_encryption_enabled so this is experimental feature and it does not work at this moment.

I think we should do the same in the Pulumi documentation - set this flag to false whenever it appears plus add same warning as on terrafrom azurerm provider doc page. It can generate a lot of frustration.

File: docs/reference/pkg/azure/postgresql/server.md