provide basic descriptions for services

.config/quickshell/services/Brightness.qml

@@ -1,7 +1,7 @@
 pragma Singleton
 pragma ComponentBehavior: Bound
 
-// From https://github.com/caelestia-dots/shell/ (`quickshell` branch)
+// From https://github.com/caelestia-dots/shell/ (`quickshell` branch) with modifications.
 // It does not have a license, but the author has given permission.
 
 import Quickshell
@@ -9,6 +9,9 @@ import Quickshell.Io
 import Quickshell.Hyprland
 import QtQuick
 
+/**
+ * For managing brightness of monitors. Supports both brightnessctl and ddcutil.
+ */
 Singleton {
     id: root