densepose documentation refers to images which are simply not there

## 📚 Documentation Issue

* Provide a link to an existing documentation/comment/tutorial:

https://github.com/facebookresearch/detectron2/blob/master/projects/DensePose/doc/TOOL_APPLY_NET.md

states "The texture files can be found in the doc/images folder"
but no, there is nothing there, see: https://github.com/facebookresearch/detectron2/tree/master/projects/DensePose/doc

* How should the above documentation/comment/tutorial improve:

Well, put a link to where the textures are - or just put the texture where the doc states they are supposed to be ?

Thank you.