Add supportedPlatforms=ios,android to SnackPlayer in animations.md

[kaseken]

issue

The preview for Animated API is not rendered correctly for TypeScript+Web.
https://reactnative.dev/docs/animations

This is because useAnimatedValue is undefined in react-native on Web.

Changes

Sets supportedPlatforms=ios,android to SnackPlayer in animations.md since web is not supported.
It was already set for the ext=js version.

before	after

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[kaseken]

I've signed to the CLA

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[Simek]

Hey @kaseken, thanks for the contribution! 👍

I have fixed the examples to work on the web within:

• fix Animation examples, allow web preview #4712

The problem here is that 0.81 docs cut did not include those changes. For now you can use "Next" (unversioned docs), or docs for older version, but we plan to regenerate 0.81 docs soon, to include all recent improvements.

[kaseken]

@Simek Understood, thanks!