Removing step to set environment variable

Author: kainawroth

articles/azure-monitor/app/availability.md

@@ -142,14 +142,6 @@ To create a new file, right-click under your timer trigger function (for example
     } 
     ```
 
-1. Define the `REGION_NAME` environment variable as a valid Azure availability location.
-
-    To list available regions, run the following command in [Azure CLI](/cli/azure/account?view=azure-cli-latest#az-account-list-locations&preserve-view=true):
-
-    ```azurecli
-    az account list-locations -o table
-    ```
-
 1. Replace the existing code in **run.csx** with the following:
 
     ```csharp