config.in: update swayidle/swaylock example

config.in

@@ -34,11 +34,11 @@ output * bg @datadir@/backgrounds/sway/Sway_Wallpaper_Blue_1920x1080.png fill
 #
 # Example configuration:
 #
-#exec swayidle \
+# exec swayidle -w \
-#    timeout 300 'swaylock -c 000000' \
+#          timeout 300 'swaylock -f -c 000000' \
-#    timeout 600 'swaymsg "output * dpms off"' \
+#          timeout 600 'swaymsg "output * dpms off"' \
-#       resume 'swaymsg "output * dpms on"' \
+#               resume 'swaymsg "output * dpms on"' \
-#    before-sleep 'swaylock -c 000000'
+#          before-sleep 'swaylock -f -c 000000'
 #
 # This will lock your screen after 300 seconds of inactivity, then turn off
 # your displays after another 300 seconds, and turn your screens back on when