bpo-29969: Typo in decimal error message

[agoose77]

No description provided.

[the-knights-who-say-ni]

Hello, and thanks for your contribution!

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[DimitrisJim]

Thanks for the patch, if you can, please change the title of the PR to include the issue number on bugs.python.org, i.e:

bpo-29969: Typo in ...

p.s: Don't be alarmed by the failed travis build. It's an issue with sphinx, not with your change :-).

[agoose77]

@DimitrisJim Thanks for the feedback, I appreciate the warm welcome.

[skrah]

Thanks!