Doc request, add attr_args_process to narrative pages

[iainctduncan]

Hi C74 folks, it would be great if the narrative sdk pages on attributes mentioned the attr_args_process function to let folks know that that is necessary in order to get your attributes filled in from @ args in the object box. Right now, that function is only in the api ref docs, and it took me a while to figure out that that's what I was missing, though I eventually I found it in the examples. If this is something I can do somehow, please let me know. (I'm not clear whether public pull requests are accepted for those sorts of things) thanks!

[tap]

Hi! Public PRs are accepted from any individual who has signed our CLA at https://cycling74.com/cla