docs: iOS Hermes export USE_HERMES=true warning added.

Author: zaferatli

website/versioned_docs/version-0.81/hermes.md

@@ -83,6 +83,8 @@ yarn ios --mode Release
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+Add `export USE_HERMES=true` to `/ios/.xcode.env` for [Hermes bytecoded](https://github.com/facebook/react-native/blob/4d2e38edd97a87e93cb95a8a0021abf73765cf28/packages/react-native/scripts/react-native-xcode.sh#L166C8-L166C18) bundle on iOS.
+
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