[docs] [issue21382] Signal module doesnt raises ValueError Exception

[Tim Golden]

Tim Golden added the comment:

To be honest I can't get excited about this one. The only sensible change is to remove the rather specific comment about ValueError and just leave the fact that only certain signals are valid. 

Because the C code defines module-level constants on the basis of whether the platform C-lib defines them, different platforms will have different module attributes. It would be unusual for us to list all the combinations.

Adding Brian Curtin as he made the original change.

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nosy: +brian.curtin, tim.golden

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<http://bugs.python.org/issue21382>
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