There is no tutorial because its a new feature, I might get around to it at some point but its a low priority as there is lots of stuff on the web about using relative paths for blender projects.
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Look up using relative paths for blender:
downlaod the blender slash279 demo file (it uses relative paths) as an example:
Here: https://cloud.blender.org/p/gallery/59819ee681191741ad07d283
There is no tutorial because its a new feature, I might get around to it at some point but its a low priority as there is lots of stuff on the web about using relative paths for blender projects.