[scaladoc] Closes #4306. Review by extempore.

git-svn-id: http://lampsvn.epfl.ch/svn-repos/scala/scala/trunk@24473 5e8d7ff9-d8ef-0310-90f0-a4852d11357a

Author: kzys

src/compiler/scala/tools/nsc/doc/model/ModelFactory.scala

@@ -281,7 +281,9 @@ class ModelFactory(val global: Global, val settings: doc.Settings) { thisFactory
       normalizeTemplate(RootPackage)
     case ScalaObjectClass | ObjectClass =>
       normalizeTemplate(AnyRefClass)
-    case _ if aSym.isModuleClass || aSym.isPackageObject =>
+    case _ if aSym.isPackageObject =>
+      aSym
+    case _ if aSym.isModuleClass =>
       normalizeTemplate(aSym.sourceModule)
     case _ =>
       aSym