improve typings: GenerateFrameNames

Author: Chnapy

src/animations/typedefs/GenerateFrameNames.js

@@ -8,5 +8,5 @@
  * @property {string} [suffix=''] - The string to append to every resulting frame name if using a range or an array of `frames`.
  * @property {integer} [zeroPad=0] - The minimum expected lengths of each resulting frame's number. Numbers will be left-padded with zeroes until they are this long, then prepended and appended to create the resulting frame name.
  * @property {Phaser.Types.Animations.AnimationFrame[]} [outputArray=[]] - The array to append the created configuration objects to.
- * @property {boolean} [frames=false] - If provided as an array, the range defined by `start` and `end` will be ignored and these frame numbers will be used.
+ * @property {(boolean|integer[])} [frames=false] - If provided as an array, the range defined by `start` and `end` will be ignored and these frame numbers will be used.
  */