Update expression_el.rst
Update expression_el.rst

Fixed formatting in expresssion_el.rst
ryez/gatling,ryez/gatling,MykolaB/gatling,gatling/gatling,GabrielPlassard/gatling,timve/gatling,gatling/gatling,GabrielPlassard/gatling,timve/gatling,thkluge/gatling,pwielgolaski/gatling,pwielgolaski/gatling,MykolaB/gatling,pwielgolaski/gatling,wiacekm/gatling,wiacekm/gatling,timve/gatling,gatling/gatling,timve/gatling,thkluge/gatling,thkluge/gatling,ryez/gatling,MykolaB/gatling,wiacekm/gatling,gatling/gatling,ryez/gatling,wiacekm/gatling,wiacekm/gatling,GabrielPlassard/gatling,thkluge/gatling,gatling/gatling,MykolaB/gatling,GabrielPlassard/gatling,pwielgolaski/gatling