Update Readme for NetScaler Terraform

[LooseDevGoose]

Removed old notes from Sven to prevent confusion and linked the new reference article.

[github-actions]

Test Results

  2 files  ±0   2 suites  ±0   0s ⏱️ ±0s
106 tests ±0  42 ✅ ±0  0 💤 ±0  64 ❌ ±0 
129 runs  ±0  42 ✅ ±0  0 💤 ±0  87 ❌ ±0 

For more details on these failures, see this check.

Results for commit d5e14fe. ± Comparison against base commit 7bc6697.

This pull request removes 3 and adds 3 tests. Note that renamed tests count towards both.

terraform/azure/delivery/avd/workspaces.tf ‑ terraform_required_providers
terraform/azure/modules/azure.mp.vm.windows/virtual_machine.tf ‑ terraform_required_providers
terraform/vmware/infra/main.tf ‑ terraform_required_providers

terraform/azure/delivery/avd/network_interfaces.tf ‑ terraform_required_providers
terraform/azure/modules/azure.mp.vm.windows/network_interfaces.tf ‑ terraform_required_providers
terraform/vmware/infra/vault.tf ‑ terraform_required_providers