Fixed jsdocs to flag arguments as optional. Fix phaserjs#4506

Author: photonstorm

CHANGELOG.md

@@ -176,7 +176,7 @@
 
 My thanks to the following for helping with the Phaser 3 Examples, Docs and TypeScript definitions, either by reporting errors, fixing them or helping author the docs:
 
-@sky-coding @G-Rath @S4n60w3n @rootasjey @englercj @josephmbustamante @Jason-Cooke @Zamiell @krzysztof-grzybek @S4n60w3n @m31271n @peterellisjones @martinlindhe @TylerMorley @samme
+@sky-coding @G-Rath @S4n60w3n @rootasjey @englercj @josephmbustamante @Jason-Cooke @Zamiell @krzysztof-grzybek @S4n60w3n @m31271n @peterellisjones @martinlindhe @TylerMorley @samme @schomatis
 
 
 ## Version 3.16.2 - Ishikawa - 11th February 2019

src/physics/matter-js/Factory.js

@@ -115,8 +115,8 @@ var Factory = new Class({
      * @param {number} x - The X coordinate of the center of the Body.
      * @param {number} y - The Y coordinate of the center of the Body.
      * @param {number} radius - The radius of the circle.
-     * @param {object} options - An object of properties to set on the Body. You can also specify a `chamfer` property to automatically adjust the body.
-     * @param {number} maxSides - The maximum amount of sides to use for the polygon which will approximate this circle.
+     * @param {object} [options] - An object of properties to set on the Body. You can also specify a `chamfer` property to automatically adjust the body.
+     * @param {number} [maxSides] - The maximum amount of sides to use for the polygon which will approximate this circle.
      *
      * @return {MatterJS.Body} A Matter JS Body.
      */