Documentation: corrections Beszel widget docs (#4282)

Co-authored-by: shamoon <[email protected]>

docs/widgets/services/beszel.md

@@ -3,10 +3,12 @@ title: Beszel
 description: Beszel Widget Configuration
 ---
 
-Learn more about [Beszel]()
+Learn more about [Beszel](https://github.com/henrygd/beszel)
 
 The widget has two modes, a single system with detailed info if `systemId` is provided, or an overview of all systems if `systemId` is not provided.
 
+The `systemID` in the `id` field on the collections page of Beszel.
+
 Allowed fields for 'overview' mode: `["systems", "up"]`
 Allowed fields for a single system: `["name", "status", "updated", "cpu", "memory", "disk", "network"]`