Added missing jsdocs for phaserjs#3996

Author: photonstorm

src/geom/polygon/Polygon.js

@@ -174,6 +174,19 @@ var Polygon = new Class({
         return this.area;
     },
 
+    /**
+     * Returns an array of Point objects containing the coordinates of the points around the perimeter of the Polygon,
+     * based on the given quantity or stepRate values.
+     *
+     * @method Phaser.Geom.Polygon#getPoints
+     * @since 3.12.0
+     *
+     * @param {integer} quantity - The amount of points to return. If a falsey value the quantity will be derived from the `stepRate` instead.
+     * @param {number} [stepRate] - Sets the quantity by getting the perimeter of the Polygon and dividing it by the stepRate.
+     * @param {array} [output] - An array to insert the points in to. If not provided a new array will be created.
+     *
+     * @return {Phaser.Geom.Point[]} An array of Point objects pertaining to the points around the perimeter of the Polygon.
+     */
     getPoints: function (quantity, step, output)
     {
         return GetPoints(this, quantity, step, output);