Clarrify folder layout

In configuring the MacOS XCode build, for some reason I had chosen to set/change the layout to a generic_layout.

I've only just come to understand that this was changing the management of XCodeDeps config forcing the xcconfig generation into different folders so that it was not preparing a multi config a described

https://github.com/conan-io/docs/blob/787931818bd07e98d765d5488dc5276488193c0d/reference/tools/apple/xcodedeps.rst?plain=1#L50-L53

Looking at the XCodeDeps doc, it was not clear at this point why the `generate one single file
(*conandeps.xcconfig*) aggregating all the files for the direct dependencies` was not creating the single file instead creating 1 in each build_type and arch.

It may be helpful to others to understand this link between layout and the deps/tools setup