another AbstractFunction exclude in link-validator.conf (apache#506)

Author: pjfanning

scripts/link-validator.conf

@@ -56,6 +56,8 @@ site-link-validator {
     "https://www.reactivemanifesto.org"
     # Problematic link generated by scaladoc
     "https://www.scala-lang.org/api/2.13.12/scala/runtime/AbstractFunction1.html"
+    "https://www.scala-lang.org/api/2.13.12/scala/runtime/AbstractFunction2.html"
+    "https://www.scala-lang.org/api/2.13.12/scala/runtime/AbstractFunction3.html"
     # Bug, see https://github.com/scala/bug/issues/12807 and https://github.com/lampepfl/dotty/issues/17973
     "https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/StandardOpenOption$.html"
     # Occasionally returns a 500 Internal Server Error