Update doc/providers/serializer.rst
Update doc/providers/serializer.rst

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