[docs] [issue16891] Fix docs about module search order

[Nick Coghlan]

Nick Coghlan added the comment:

The docs sometimes try to draw a sharp distinction between modules and
packages, but it's essentially a lie - a package is really just a module
with a __path__ attribute, and if you know what you are doing, you make
even an ordinary module behave like a package (e.g. os.path)

Until 3.3, the import system had too many internal inconsistencies for sane
documentation. That's fixed in 3.3, but no comprehensive docs will be
happening for earlier versions.

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