Update azure.env.example

Author: aegilops

scripts/azure.env.example

@@ -7,7 +7,8 @@ AZURE_LOCATION="eastus"
 AZURE_SUBSCRIPTION_ID="..."
 
 # pick an appropriate name for the function app
-AZURE_FUNCTION_APP_NAME="slack-secret-scanning-notifier"
+# you *must* change this, since you cannot duplicate any existing Function App name
+AZURE_FUNCTION_APP_NAME="..." # e.g. slack-secret-scanning-notifier-<suffix>
 
 # pick an appropriate name for a new resource group
 AZURE_RESOURCE_GROUP="${AZURE_FUNCTION_APP_NAME}-rg"