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

Take 2 on sorting out the parenthesis in the registration code snippet.
akucherevskiy/developex_test,Tobion/Silex,plotek/Silex,peterkokot/Silex,lokhman/Silex,tcx1000/Silex,cesarmarinhorj/Silex,mmauri04/Silex,beealone/Silex,RayRutjes/Silex,Incognito/silex-fork,naderman/Silex,silexphp/Silex,naderman/Silex,mathroc/Silex,gencer/Silex,lokhman/Silex,JPry/Silex,Tobion/Silex,RayRutjes/Silex,romainneutron/Silex,CarsonF/Silex,CarsonF/Silex,CarsonF/Silex,cgsmith/Silex,fabpot/Silex,Incognito/silex-fork,mathroc/Silex,peterkokot/Silex,cgsmith/Silex,fhinkel/Silex,SanderKnape/Silex,akucherevskiy/developex_test,fhinkel/Silex,SpacePossum/Silex,arduanov/Silex,GromNaN/Silex,GromNaN/Silex,GromNaN/Silex,beealone/Silex,SpacePossum/Silex,Tobion/Silex,tcx1000/Silex,Xephi/Silex,peterkokot/Silex,Xephi/Silex,JPry/Silex,arduanov/Silex,naderman/Silex,cesarmarinhorj/Silex,mmauri04/Silex,fabpot/Silex,jdreesen/Silex,mTorres/Silex,romainneutron/Silex,jdreesen/Silex,SanderKnape/Silex,akucherevskiy/developex_test,mTorres/Silex,plotek/Silex,romainneutron/Silex