OP-5810 - documentation updates to include new returned values and new p...

...arameters for purchases.
V1 did this as a string resource because this body of information was output in multiple locations.

For V3, this is not the case, and having it in a string makes it more inconvenient to edit so I've moved it out of a string resource into the document directly.

If we need to have this block in multiple locations, we'll put it into a string resource at that point.