Update doc/filters/split.rst
Update doc/filters/split.rst

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