React Native: Remove wizard uninstall docs (#15409)

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## DESCRIBE YOUR PR
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Removed the uninstall doc from React Native since the functionality was
removed a while ago with
getsentry/sentry-wizard#983

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Author: antonis

docs/platforms/react-native/troubleshooting/index.mdx

@@ -394,15 +394,3 @@ plugins {
 AGP 7.4+ introduced new APIs for injecting into assets that the Sentry Android Gradle Plugin uses to avoid this circular dependency. Since AGP 7.4 was released in 2023, we recommend upgrading to the latest stable version.
 
 For more information, see [GitHub issue #756](https://github.com/getsentry/sentry-android-gradle-plugin/issues/756).
-
-## Uninstalling the SDK
-
-To remove the SDK from your project, run the following commands:
-
-```bash
-npx @sentry/wizard -i reactNative -p ios android --uninstall
-yarn remove @sentry/react-native
-cd ios && pod install
-```
-
-Once that's done, remove the `ios/sentry.properties` and `android/sentry.properties` files. Finally, remove all the code using `@sentry/react-native` from your project.