Disable scaladoc warnings on 2.12 and 2.13

Author: mpilquist

build.sbt

@@ -76,7 +76,9 @@ lazy val core = crossProject(JVMPlatform, JSPlatform, NativePlatform)
       if (tlIsScala3.value) Nil
       else List("org.scala-lang" % "scala-reflect" % scalaVersion.value % "provided")
     },
-    scalacOptions := scalacOptions.value.filterNot(_ == "-source:3.0-migration")
+    scalacOptions := scalacOptions.value.filterNot(_ == "-source:3.0-migration"),
+    Compile / doc / scalacOptions ++= (if (scalaVersion.value.startsWith("2.")) Seq("-nowarn")
+                                       else Nil)
   )
   .settings(
     libraryDependencies ++= Seq(