sway.5: Improve documentation
Document the optional arguments of the fullscreen command.
@@ -130,8 +130,9 @@ They are expected to be used with *bindsym* or at runtime through *swaymsg*(1).
*focus* mode\_toggle
Moves focus between the floating and tiled layers.
-*fullscreen*
- Toggles fullscreen for the focused view.
+*fullscreen* [enable|disable|toggle]
+ Makes focused view fullscreen, non-fullscreen, or the opposite of what it
+ is now. If no argument is given, it does the same as _toggle_.
*gaps* inner|outer|horizontal|vertical|top|right|bottom|left all|current
set|plus|minus <amount>
