Fix typo of deprecation messages of `scala.compat.Platform`.
Fix typo of deprecation messages of `scala.compat.Platform`.

lrytz/scala,scala/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,lrytz/scala,scala/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,martijnhoekstra/scala,scala/scala,scala/scala,lrytz/scala,martijnhoekstra/scala,scala/scala,lrytz/scala,martijnhoekstra/scala