[issue21510] fma documentation should provide better example.

[Mark Dickinson]

Mark Dickinson added the comment:

I wouldn't want to drop the simple example: I suspect that many of those looking at fma won't have the first idea what it does, and that first example shows clearly that it's a fused multiply-add.

But +1 for an example that demonstrates the single rounding, either in the online docs or the docstring (or both).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21510>
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