Stale 5.x migration guide documentation

[helblinglilly]

There is a page in your docs https://docs.developers.flagship.io/docs/react-native-migration-to-5x that appears like it is meant to assist in the migration to the latest release.

However, the contents of this page seem to reference the 3 -> 4 migration guide.

Please update your documentation, or specify if there are no breaking changes from 4 -> 5

Current contents:

[Heihokon]

Hi @helblinglilly, thank you for your feedback!

We've improved the documentation, and the guide now supports both versions 4 and 5.

Feel free to check out our change logs for more details.

[helblinglilly]

Thanks @Heihokon !

That's much clearer now 😄