missing note in parameter passing rules images

[albestro]

Checking the parameter passing guidelines I realized that about the note

or return unique_ptr<X>/make_shared<X> at the cost of a dynamic allocation

in both "normal" and "advanced" images there is the note but the * references inside the tables are missing;

Moreover, I report here for reference the frame in the video where @hsutter presented it, and from which it is possible to see the original image and where the note should be put.

reference: https://www.youtube.com/watch?v=xnqTKD8uD64&t=3507s

I didn't open a PR because I don't know if there is any layout/template to use for generating the image. In case, I'll look forward to your indications and I'll be glad to do my small contribution.