This page content seems to be missing
It is referenced here, at the end of these pages
…and it looks like it would be interesting to have in orther to understand blueprint spline scripting 
Hello AxSoler,
Thank you for reporting this. It seems like it wasn’t intended to be published yet so I’ve put in a documentation bug for it under the number UEDOC-4215.
We’ll try to have it fixed soon, although it’ll likely only be taken out for a while as it isn’t written yet it seems.
Thanks Matthew