[BUG] AFS shared storage inconsistent variable set in the samples

[sean-freeman]

Describe the bug

Inconsistent variable set in the samples, which the documentation does not accommodate for.... and which will cause errors when reaching Ansible installation:

azureadm@mgmtweeudep00deploy00:~$ grep -rnw 'use_AFS_for_shared_storage =' ~/Azure_SAP_Automated_Deployment/sap-samples/WORKSPACES/LANDSCAPE

/LAB-SECE-SAP04-INFRASTRUCTURE/LAB-SECE-SAP04-INFRASTRUCTURE.tfvars:500:use_AFS_for_shared_storage = true
/QA-WEEU-SAP02-INFRASTRUCTURE/QA-WEEU-SAP02-INFRASTRUCTURE.tfvars:503:use_AFS_for_shared_storage = true
/DEV-NOEU-SAP01-INFRASTRUCTURE/DEV-NOEU-SAP01-INFRASTRUCTURE.tfvars:520:use_AFS_for_shared_storage = false
/DEV-WEEU-SAP01-INFRASTRUCTURE/DEV-WEEU-SAP01-INFRASTRUCTURE.tfvars:521:use_AFS_for_shared_storage = false
/QA-NOEU-SAP02-INFRASTRUCTURE/QA-NOEU-SAP02-INFRASTRUCTURE.tfvars:503:use_AFS_for_shared_storage = true
/PRD-WEEU-SAP03-INFRASTRUCTURE/PRD-WEEU-SAP03-INFRASTRUCTURE.tfvars:503:use_AFS_for_shared_storage = true