docs(ngAnimate) - Correct keyframe to keyframeStyle

[intellix]

Documentation for $animateCss says there is a keyframe property when in fact it is keyframeStyle

[googlebot]

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

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please let us know the company's name.

[intellix]

I signed it!

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.

[intellix]

Ahah, believe the email on the commit is different. Should have fixed CLA now

[googlebot]

CLAs look good, thanks!

[intellix]

Kind of linked to: #12340 Think it makes sense to go up at the same time

[matsko]

Merged in as 7202bfa. Thank you.