test link without realm directive (#919)

Author: Chris Cho

source/kotlin-drivers.txt

@@ -29,6 +29,6 @@ to work with MongoDB in Kotlin:
 - Use the :doc:`Kotlin Sync Driver </kotlin-sync>` for synchronous Kotlin
   applications.
 
-You can use the :realm:`MongoDB Atlas Device Kotlin SDK </sdk/kotlin/install>`
+You can use the `MongoDB Atlas Device Kotlin SDK <https://www.mongodb.com/docs/realm/sdk/kotlin/install/>`__
 in Android or Kotlin Multiplatform (KMP) applications to access Atlas App
 Services and to manage your Realm data.