Update PBS documentation

docs/troubleshooting/index.md

@@ -20,7 +20,7 @@ All service widgets work essentially the same, that is, homepage makes a proxied
 
 1.  URLs should not end with a / or other API path. Each widget will handle the path on its own.
 
-2.  All services with a widget require a unique name.
+2.  All services with a widget require a unique name as well as a unique group (and all subgroups) name.
 
 3.  Verify the homepage installation can connect to the IP address or host you are using for the widget `url`. This is most simply achieved by pinging the server from the homepage machine, in Docker this means _from inside the container_ itself, e.g.:
 

docs/widgets/services/proxmoxbackupserver.md

@@ -5,6 +5,8 @@ description: Proxmox Backup Server Widget Configuration
 
 Learn more about [Proxmox Backup Server](https://www.proxmox.com/en/proxmox-backup-server/overview).
 
+Create a user and an API token similar to the [Proxmox VE description](proxmox.md). The "Audit" role is required for both the user and token (not group).
+
 Allowed fields: `["datastore_usage", "failed_tasks_24h", "cpu_usage", "memory_usage"]`.
 
 ```yaml
@@ -13,4 +15,5 @@ widget:
   url: https://proxmoxbackupserver.host:port
   username: api_token_id
   password: api_token_secret
+  datastore: datastore_name #optional; if ommitted, will display a combination of all datastores used / total
 ```