Fix docs installation path in rubinius-doc package
Fix docs installation path in rubinius-doc package

deiv/rubinius-pkg,yob/debian-rubinius,yob/debian-rubinius,yob/debian-rubinius,deiv/rubinius-pkg,deiv/rubinius-pkg,yob/debian-rubinius,yob/debian-rubinius,deiv/rubinius-pkg,deiv/rubinius-pkg,yob/debian-rubinius,yob/debian-rubinius,deiv/rubinius-pkg