add integer note to each parameter

docs/api/structures/rectangle.md

@@ -1,8 +1,6 @@
 # Rectangle Object
 
-* `x` Number - The x coordinate of the origin of the rectangle
-* `y` Number - The y coordinate of the origin of the rectangle
-* `width` Number
-* `height` Number
-
-Note numeric values must be integers.
+* `x` Number - The x coordinate of the origin of the rectangle (must be an integer)
+* `y` Number - The y coordinate of the origin of the rectangle (must be an integer)
+* `width` Number - The width of the rectangle (must be an integer)
+* `height` Number - The height of the rectangle (must be an integer)