Fix parameter documentation for curvePoint

Author: shawdm

src/core/shape/curves.js

@@ -950,10 +950,10 @@ p5.prototype.curveTightness = function(t) {
  * between them.
  *
  * @method curvePoint
- * @param {Number} a coordinate of first anchor point.
- * @param {Number} b coordinate of first control point.
- * @param {Number} c coordinate of second control point.
- * @param {Number} d coordinate of second anchor point.
+ * @param {Number} a coordinate of first control point.
+ * @param {Number} b coordinate of first anchor point.
+ * @param {Number} c coordinate of second anchor point.
+ * @param {Number} d coordinate of second control point.
  * @param {Number} t amount to interpolate between 0 and 1.
  * @return {Number} coordinate of a point on the curve.
  *