[docs] [issue28615] Document clarification: Section 5.4 Complex Number

[Roundup Robot]

Roundup Robot added the comment:

New changeset f8d12cb7d0fd by Terry Jan Reedy in branch '2.7':
Issue #28615: Backport imaginary/complex number text from 3.x.
https://hg.python.org/cpython/rev/f8d12cb7d0fd

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nosy: +python-dev

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