Add output dpms to manpage

sway/sway-output.5.scd

@@ -69,8 +69,7 @@ must be separated by one space. For example:
 	given scaling mode (one of "stretch", "fill", "fit", "center", "tile"). If
 	the specified file cannot be accessed or if the image does fill the entire
 	output, a fallback color may be provided to cover the rest of the output.
-	__fallback_color__ should be specified as _#RRGGBB_. Alpha is not
+	__fallback_color__ should be specified as _#RRGGBB_. Alpha is not supported.
-	supported.
 
 *output* <name> background|bg <color> solid_color
 	Sets the background of the given output to the specified color. _color_
@@ -80,14 +79,18 @@ must be separated by one space. For example:
 	Sets the background transform to the given value. Can be one of "90", "180",
 	"270" for rotation; or "flipped", "flipped-90", "flipped-180", "flipped-270"
 	to apply a rotation and flip, or "normal" to apply no transform. If a single
-	output is chosen and a rotation direction is specified 
+	output is chosen and a rotation direction is specified (_clockwise_ or
-	(_clockwise_ or _anticlockwise_) then the transform is added or 
+	_anticlockwise_) then the transform is added or subtracted from the current
-	subtracted from the current transform.
+	transform.
 
 *output* <name> disable|enable
 	Enables or disables the specified output (all outputs are enabled by
 	default).
 
+*output* <name> dpms on|off
+	Enables or disables the specified output via DPMS. To turn an output off
+	(ie. blank the screen but keep workspaces as-is), one can set DPMS to off.
+
 # SEE ALSO
 
 *sway*(5) *sway-input*(5)