code: public ClassDoc[] allClasses(PackageDoc pkgDoc) {
          return pkgDoc.isIncluded() ?
                pkgDoc.allClasses() :
                getArray(allClasses, utils.getPackageName(pkgDoc));
      }
docs: Return all of the classes specified on the command-line that
  belong to the given package.
  @param pkgDoc the package to return the classes for.