Update ReducedMotionConfig.mdx (#6598)

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## Summary

Adding warning that ReducedMotionConfig is applied globally, as I was
checking and docs and did not know until I checked the
[pr](https://github.com/software-mansion/react-native-reanimated/blob/0bd65b35bbe33c69590e4bfcb836f618ff066534/packages/react-native-reanimated/src/component/ReducedMotionConfig.tsx)
this component was introduced in

## Test plan

check the website after it gets deployed

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Co-authored-by: Krzysztof Piaskowy <[email protected]>

packages/docs-reanimated/docs/components/ReducedMotionConfig.mdx

@@ -7,6 +7,12 @@ sidebar_position: 1
 
 `ReducedMotionConfig` component let's you change behavior in response to the device's reduced motion accessibility setting. By default it disables all animation when the reduced motion is enabled on a device. You can adjust it for your specific use case. You can learn more about [Accessibility](/docs/guides/accessibility) and [`useReducedMotion`](/docs/device/useReducedMotion) in Reanimated.
 
+:::caution
+
+The new configuration will be applied globally across the entire application.
+
+:::
+
 ## Reference
 
 ```javascript