poly_factors -- robustify docstring
poly_factors -- robustify docstring

Internally poly_factors calls roots, which returns zeros of a poly in dict.
Then poly_factor iterates over that dict and construct factors.

Thus, ordering of constructed factors depend on the hash function used, and
this particular doctest has to be "robustified" :(


Signed-off-by: Kirill Smelkov <b0eeaac46e675e9f95bf68c0df1041cf581c26f4@landau.phys.spbu.ru>
Signed-off-by: Ondrej Certik <b816faa87b7d35274d2e545c5be11ed4376f3ccf@certik.cz>

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