Add engine version key notice for github package

Author: tustanivsky

docs/platforms/unreal/index.mdx

@@ -75,6 +75,12 @@ Currently, this method is available only for C++ UE projects. Blueprint projects
 
 </Alert>
 
+<Alert>
+
+To avoid warnings during the build for licensee versions of Unreal Engine, the `EngineVersion` key is not set in the `Sentry.uplugin` for the `github` package.
+
+</Alert>
+
 ### Installing from Fab
 
 Sentry SDK can be downloaded via the [standard installation process](https://dev.epicgames.com/documentation/en-us/unreal-engine/working-with-plugins-in-unreal-engine#installingpluginsfromtheunrealenginemarketplace) from its [Epic Games Fab page](https://www.fab.com/listings/eaa89d9d-8d39-450c-b75f-acee010890a2).