message: Add missing documented PIXI type in utils
diff: @@ -235,6 +235,7 @@ declare function isObjectEmpty (obj: object): boolean
  * @param fallback - A fallback texture to use if the requested source is
  * unavailable or invalid
  * (default: `null`)
  + * @returns (type: `Promise<PIXI.Texture>`)
  */
  declare function loadTexture (
  src: string,
  