Change doc link to point to AnimatedValueXY

[garlic-rice-with-butter]

Currently goes to the same page

Motivation

Online doc was not helpful because the link kept going to the wrong page. Someone told me to make a pull request

Test Plan

Documentation change
Go to original link https://facebook.github.io/react-native/docs/animated.html#animatedvaluexy
See that it does not have any info on valuexy

Go to https://facebook.github.io/react-native/releases/next/docs/animatedvaluexy.html
See that the page loads and has information about valuexy

Release Notes

[facebook-github-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. In order for us to review and merge your code, please sign up at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need the corporate CLA signed.

If you have received this in error or have any questions, please contact us at cla@fb.com. Thanks!

[pull-bot]

@facebook-github-bot label Android

Generated by 🚫 dangerJS

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[facebook-github-bot]

@shergin is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.