remove pbs reference in doc
remove pbs reference in doc

amoffat/sh,simudream/sh,rdhyee/sh,germangh/sh,ppannuto/sh,hacosta/python-sh,lwgarmstrong/sh,pombredanne/sh,Stupeflix/sh,jakirkham/sh,twocngdagz/sh,pdelong42/sh,amoffat/sh,hacosta/python-sh,rsmith31415/sh,z-fork/sh,achernet/sh