fix actions/doc

Javadoc on JDK11 no longer generates package-list it seems.

sbt/src/sbt-test/actions/doc/build.sbt

@@ -0,0 +1,5 @@
+lazy val root = (project in file("."))
+  .settings(
+    crossPaths := false,
+    Compile / doc / scalacOptions += "-Xfatal-warnings"
+  )

sbt/src/sbt-test/actions/doc/test

@@ -1,7 +1,3 @@
-> 'set crossPaths := false'
-
-> 'set scalacOptions in (Compile, doc) += "-Xfatal-warnings"'
-
 -> doc
 
 > 'set sources in (Compile, doc) := { val src = (sources in Compile).value; src.filterNot(_.getName contains "B") }'
@@ -29,9 +25,9 @@ $ absent "target/api/java"
 > ; clean ; doc
 
 # pure java project, only javadoc at top level
-$ exists "target/api/package-list"
+$ exists "target/api/index.html"
 $ absent "target/api/index.js"
 
-# pending 
+# pending
 # $ absent "target/api/scala"
-#$ absent "target/api/java"
+# $ absent "target/api/java"