small edits to cBioPortal job README
small edits to cBioPortal job README

UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_