Corrected an XPath example.
Corrected an XPath example.

altmetric/oga,YorickPeterse/oga,dfockler/oga,ttasanen/oga,jeffreybaird/oga,dfockler/oga,altmetric/oga,YorickPeterse/oga,ttasanen/oga,altmetric/oga,dfockler/oga,YorickPeterse/oga,jeffreybaird/oga,ttasanen/oga,jeffreybaird/oga,dfockler/oga,ttasanen/oga,altmetric/oga,YorickPeterse/oga,jeffreybaird/oga,YorickPeterse/oga,altmetric/oga,dfockler/oga,jeffreybaird/oga,ttasanen/oga