[issue4903] binascii.crc32() - document signed vs unsigned results

[Gabriel Genellina]

Gabriel Genellina <gagsl-py2 at yahoo.com.ar> added the comment:

Just a small note on the wording: "will have" and "will always be" look 
too strong to me. I'd just use is, are. Present tense seems to be --in 
general-- the preferred style in the documentation.

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nosy: +gagenellina

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