Update rbac-guide.md

Author: jlichwa

articles/key-vault/general/rbac-guide.md

@@ -18,7 +18,7 @@ ms.custom: "devx-track-azurepowershell, devx-track-azurecli"
 > [!NOTE]
 > Azure App Service certificate configuration through Azure Portal does not support Key Vault RBAC permission model. You can use Azure PowerShell, Azure CLI, ARM template deployments with **Key Vault Certificate User** role assignment for App Service global identity, for example Microsoft Azure App Service' in public cloud.
 
-Azure role-based access control (Azure RBAC) is an authorization system built on [Azure Resource Manager](../../azure-resource-manager/management/overview.md) that provides fine-grained access management of Azure resources.
+Azure role-based access control (Azure RBAC) is an authorization system built on [Azure Resource Manager](../../azure-resource-manager/management/overview.md) that provides centralized access management of Azure resources.
 
 Azure RBAC allows users to manage Key, Secrets, and Certificates permissions. It provides one place to manage all permissions across all key vaults.