added config notes regarding which renderer works best for desktop vs laptop

picom/picom.conf

@@ -207,8 +207,8 @@ blur-background-exclude = [
 # Specify the backend to use: `xrender`, `glx`, or `xr_glx_hybrid`.
 # `xrender` is the default one
 # Set to "glx" with nvidia drivers prevents fullscreen screen tearing
-backend = "glx"
-# backend = "xrender";
+# backend = "glx" # works on desktop
+backend = "xrender"; # works on laptop
 
 # Enable/disable VSync.
 # vsync = false