clearArea: Updated ReadMe

Author: ChristophLHR

README.md

@@ -18,7 +18,12 @@ builder help
 ```lua
 -- Builds a floor with the specified size.
 -- Uses the Item in Slot 1 as Buildingblock!
-builder floor -w <width> -l <length> -m <"left"|"right">
+builder floor -w <width> -l <length> -mH <"left"|"right">
 ```
 
-# Dev - Documentaion
+### clearArea
+
+```lua
+-- clears an Area of the specifed size
+builder floor -w <width> -l <length> -h <height> -mH <"left"|"right"> -mV <"up"|"down">
+```