Fix typo in datepicker example

[dtslvr]

No description provided.

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[dtslvr]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

I signed it!

[googlebot]

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[crisbeto]

LGTM

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