docs(tutorial/12 - Applying Animations): enter

[salamanderrex]

Should be enter not click. Since we define the css trigger at move, not click.

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Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[salamanderrex]

I signed it!

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CLAs look good, thanks!

[gkalpak]

Backported to v1.4.x as da03497.