HQ Threat table path descriptions

[newtpatrol]

The descriptions for the Threat table fields cur_path, base_path and fut_path don't actually say that they're file paths, and they should. Here's the current verbiage for cur_path:

cur_path (raster, required): Map of the threat’s distribution in the current scenario. Each pixel value is the relative intensity of the threat at that location.

I feel like this should say something like

File system path to a raster of the threat’s distribution in the current scenario. Each pixel value in the threat raster is the relative intensity of the threat at that location, with values between 0 and 1.

This is in investspec, so I can't change it. What I will change in the UG is making a larger Note regarding the relative nature of the paths (so that doesn't need to be replicated in each field's description, although it could be, added to the chapter text, not investspec).