Make cpp_info transitive information more clear when using components

[uilianries]

When reading the cpp_info page in Conan docs (https://docs.conan.io/2.0/reference/conanfile/methods/package_info.html) we can find explanation about cpp_info attributes and about components, but not about the transitive between them.

It would be great detailing what could be accessed via cpp_info, when having a component. For instance:

The package A has cpp_info.components["foo"].bindirs = ["lib/foo"].

• Will this bindir be available via cpp_info.bindirs (the global one)?
• When consuming package A, its cpp_info.bindirs will be available when using VirtualBuildEnv or VirtualRunEnv when not declaring A::foo in my cpp_info requires?

/cc @garethsb