[docs] [issue35325] imp.find_module() return value documentation discrepancy

[Windson Yang]

Windson Yang <wiwindson at outlook.com> added the comment:

> The documentation should state that "pathname" will be None (not the empty string) for built-in and frozen modules in order to be in line with the implementation.

Both the "file" and "pathname" will be None for built-in and frozen modules, right? In the PR @ericsnowcurrently suggested add:

>  If the module is built-in or frozen then *file* and *pathname* are both ``None`` and the *description* tuple contains empty...

I think it also works.

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<https://bugs.python.org/issue35325>
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