Docs corrections

[turuluu]

iPlug2OOS seems like a good starting point also for non-containerized workflow. I've not used claude or other LLMs with this, so I also haven't looked if the main point of the containerization is to have sandboxing for the GenAI-code-systems. However I got my old project refactored using it so I can use clion with cmake. Here's a few things I noted on the way.

In the docs guide, these arguments are wrong:
./duplicate.py PROJECT_NAME MANUFACTURER_NAME

Usage is:
Usage: duplicate.py inputprojectname outputprojectname manufacturername (outputprojectpath)

So it should be:
./duplicate.py TemplateProject PROJECT_NAME MANUFACTURER_NAME

In case someone tries to use this as a starting point for non-containerized plug-in environment, it might trip them that the iPlug submodule is cloned recursively, but its dependencies aren't. This can be done from the root of iPlug2OOS using:
./setup_container.sh