Point the hyprsunset autostart hint at autostart.lua

The comment still described the old exec-once conf syntax.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

config/hypr/hyprsunset.conf

@@ -5,8 +5,8 @@ profile {
     identity = true
 }
 
-# To enable auto switch to nightlight, set in your .config/hypr/autostart:
-# exec-once = uwsm app -- hyprsunset
+# To enable auto switch to nightlight, add to your .config/hypr/autostart.lua:
+# o.launch_on_start("hyprsunset")
 # and use the following:
 # profile {
 #     time = 20:00