Update doc/providers/security.rst
Update doc/providers/security.rst

Added closing bracket
cgsmith/Silex,mmauri04/Silex,CarsonF/Silex,romainneutron/Silex,cesarmarinhorj/Silex,plotek/Silex,fhinkel/Silex,Incognito/silex-fork,cesarmarinhorj/Silex,fhinkel/Silex,mTorres/Silex,akucherevskiy/developex_test,beealone/Silex,naderman/Silex,RayRutjes/Silex,silexphp/Silex,SpacePossum/Silex,peterkokot/Silex,RayRutjes/Silex,SpacePossum/Silex,fabpot/Silex,CarsonF/Silex,gencer/Silex,SanderKnape/Silex,jdreesen/Silex,GromNaN/Silex,GromNaN/Silex,Tobion/Silex,GromNaN/Silex,jdreesen/Silex,akucherevskiy/developex_test,JPry/Silex,akucherevskiy/developex_test,Xephi/Silex,Incognito/silex-fork,arduanov/Silex,peterkokot/Silex,Xephi/Silex,peterkokot/Silex,mmauri04/Silex,fabpot/Silex,Tobion/Silex,tcx1000/Silex,naderman/Silex,mathroc/Silex,beealone/Silex,JPry/Silex,tcx1000/Silex,cgsmith/Silex,SanderKnape/Silex,arduanov/Silex,lokhman/Silex,plotek/Silex,naderman/Silex,CarsonF/Silex,romainneutron/Silex,lokhman/Silex,mTorres/Silex,romainneutron/Silex,Tobion/Silex,mathroc/Silex