added PR link to doc in tests

Author: Roman Janusz

commons-mongo/jvm/src/test/scala-2.13/com/avsystem/commons/mongo/typed/PolyDataWithCustomImplicits.scala

@@ -17,7 +17,8 @@ abstract class CustomPolyDataCompanion[D[_]](
 
 /**
   * This class tests (through its compilation) if implicit resolution conflicts that were
-  * previously present in [[MongoPolyAdtInstances]] are fixed.
+  * previously present in [[MongoPolyAdtInstances]] are fixed
+  * ([[https://github.com/AVSystem/scala-commons/pull/429 #429]]).
   */
 case class PolyDataWithCustomImplicits[+T](wrappy: CustomWrappy, value: List[T])
 object PolyDataWithCustomImplicits extends CustomPolyDataCompanion[PolyDataWithCustomImplicits]