added missing documentation about Twig_Loader_Chain
added missing documentation about Twig_Loader_Chain

gamernetwork/Twig,nicolas-grekas/Twig,phansys/Twig,nicolas-grekas/Twig,hason/Twig,znerol/Twig,Rvanlaak/Twig,framewr/Twig,dkarvounaris/Twig,phansys/Twig,nicolas-grekas/Twig,iKwinto/Twig,huang53798584/Twig,hason/Twig,bocharsky-bw/Twig,bocharsky-bw/Twig,Rvanlaak/Twig,moltin/Twig,znerol/Twig,Tobion/Twig,robregonm/Twig,twigphp/Twig,Tobion/Twig,huang53798584/Twig,moltin/Twig,apishka/templater,iKwinto/Twig,iKwinto/Twig,twigphp/Twig,hhamon/Twig,derickr/Twig,fsw/Twig,peterkokot/Twig,Tobion/Twig,twigphp/Twig,fsw/Twig,jamessingizi/Twig,markstory/Twig,moufmouf/Twig,Rvanlaak/Twig,moltin/Twig,hhamon/Twig,znerol/Twig,hason/Twig,huang53798584/Twig,framewr/Twig,framewr/Twig,moufmouf/Twig,loi-chuanoi/Twig,peterkokot/Twig,nicolas-grekas/Twig,jamessingizi/Twig,dkarvounaris/Twig,fsw/Twig,gencer/Twig,hhamon/Twig,craue/Twig,dkarvounaris/Twig,derickr/Twig,jamessingizi/Twig,apishka/templater,bocharsky-bw/Twig,robregonm/Twig,markstory/Twig,gencer/Twig,robregonm/Twig,gamernetwork/Twig,moufmouf/Twig,derickr/Twig,nicolas-grekas/Twig,craue/Twig,gamernetwork/Twig