Document how to run lshw

rust/agama-lib/share/examples/profile.jsonnet

@@ -3,7 +3,13 @@
 // For the schema, see
 // https://github.com/openSUSE/agama/blob/master/rust/agama-lib/share/profile.schema.json
 
-// The hw.libsonnet file contains hardware information from the "lshw" tool.
+// The "hw.libsonnet" file contains hardware information of the storage devices
+// from the "lshw" tool. It is generated by running as root:
+//
+//   lshw -json -class disk
+//
+// However, it is expected to change in the near future to include information
+// from other subsystems (e.g., network).
 local agama = import 'hw.libsonnet';
 
 // Find the biggest disk which is suitable for installing the system.