Add docs for date_modify
Add docs for date_modify

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