From Eduardo (kotlin team): 

https://github.com/realm/realm-kotlin/issues/1224 : Different versions in documentation
Hello there!In documentation ("Kotlin SDK -> install -> kotlin multiplatform"), the realm.kotlin version is different between plugins(1.4.0) and commonMain dependencies(1.5.0).  
The project synced in the "build.gradl.kts" file, but failed when I tried to build it.Most of the developers might know what the problem is and follow the latest version.  
But for the developers who just started programming, they might be confused.Thank you for your support.
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realm/realm-kotlin | Today at 8:43 AM | Added by GitHub

Can you reference the above kotlin ticket in your PR for visibility? We can easily track it and close it when you are done with it.