minor #18195 Improved the PHPdoc of FileSystem::copy() (javiereguiluz)
minor #18195 Improved the PHPdoc of FileSystem::copy() (javiereguiluz)

This PR was squashed before being merged into the 2.3 branch (closes #18195).

Discussion
----------

Improved the PHPdoc of FileSystem::copy()

| Q             | A
| ------------- | ---
| Branch        | 2.3+
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12937
| License       | MIT
| Doc PR        | -

Commits
-------

9ad67ca Improved the PHPdoc of FileSystem::copy()

oleg-andreyev/symfony,phramz/symfony,Strate/symfony,pix-art/symfony,michaelperrin/symfony,jvasseur/symfony,weaverryan/symfony,nicolas-grekas/symfony,believer-ufa/symfony,hhamon/symfony,deguif/symfony,nasimnabavi/symfony,Amo/symfony,lemoinem/symfony,mnapoli/symfony,lyrixx/symfony,Ener-Getick/symfony,k0pernikus/symfony,josephdpurcell/symfony,ewgRa/symfony,Pierstoval/symfony,tucksaun/symfony,romaricdrigon/symfony,georaldc/symfony,c960657/symfony,dosten/symfony,Einenlum/symfony,shieldo/symfony,aeoris/symfony,sroze/symfony,Engerim/symfony,e-moe/symfony,MisatoTremor/symfony,romaricdrigon/symfony,believer-ufa/symfony,mweimerskirch/symfony,lstrojny/symfony,Simperfit/symfony,patrick-mcdougle/symfony,yceruto/symfony,mickaelandrieu/symfony,alekitto/symfony,gonzalovilaseca/symfony,Einenlum/symfony,jakubsacha/symfony,joelwurtz/symfony,oleg-andreyev/symfony,vincentaubert/symfony,realityking/symfony,mihai-stancu/symfony,smatyas/symfony,romainneutron/symfony,codeclimate-testing/symfony,jean-gui/symfony,Taluu/symfony,Aliance/symfony,hiddewie/symfony,derrabus/symfony,fabpot/symfony,lemoinem/symfony,lstrojny/symfony,jameshalsall/symfony,joelwurtz/symfony,jean-gui/symfony,hhamon/symfony,apfelbox/symfony,andrerom/symfony,mvhirsch/symfony,xabbuh/symfony,mnapoli/symfony,xabbuh/symfony,pierredup/symfony,pierredup/symfony,DavidGarciaCat/symfony,e-moe/symfony,voronkovich/symfony,maidmaid/symfony,zerkms/symfony,jakzal/symfony,iltar/symfony,Ener-Getick/symfony,frankdejonge/symfony,mvhirsch/symfony,iltar/symfony,hiddewie/symfony,jzawadzki/symfony,Tobion/symfony,hacfi/symfony,unexge/symfony,lemoinem/symfony,frankdejonge/symfony,ragboyjr/symfony,natechicago/symfony,jameshalsall/symfony,aeoris/symfony,SaschaDens/symfony,OndraM/symfony,weaverryan/symfony,Nyholm/symfony,dbu/symfony,dmaicher/symfony,SpacePossum/symfony,teohhanhui/symfony,Triiistan/symfony,patrick-mcdougle/symfony,pix-art/symfony,Nyholm/symfony,jderusse/symfony,paradajozsef/symfony,jakzal/symfony,klandaika/symfony,gnat42/symfony,Soullivaneuh/symfony,Strate/symfony,joelwurtz/symfony,vincentaubert/symfony,jjanvier/symfony,mvhirsch/symfony,zerustech/symfony,nicolas-grekas/symfony,realityking/symfony,realityking/symfony,1ed/symfony,zorn-v/symfony,pamil/symfony,garak/symfony,frankdejonge/symfony,fabpot/symfony,Aliance/symfony,natechicago/symfony,HeahDude/symfony,geoffrey-brier/symfony,andrerom/symfony,believer-ufa/symfony,HeahDude/symfony,curry684/symfony,Tobion/symfony,geoffrey-brier/symfony,Amo/symfony,curry684/symfony,SaschaDens/symfony,klandaika/symfony,ewgRa/symfony,damienalexandre/symfony,shieldo/symfony,Amo/symfony,ro0NL/symfony,ogizanagi/symfony,xabbuh/symfony,symfony/symfony,derrabus/symfony,backbone87/symfony,ogizanagi/symfony,pierredup/symfony,OndraM/symfony,romainneutron/symfony,Einenlum/symfony,MisatoTremor/symfony,sstok/symfony,gonzalovilaseca/symfony,mihai-stancu/symfony,MisatoTremor/symfony,smatyas/symfony,ro0NL/symfony,havvg/symfony,Triiistan/symfony,Tobion/symfony,bendavies/symfony,xabbuh/symfony,damienalexandre/symfony,sgehrig/symfony,inso/symfony,maidmaid/symfony,bendavies/symfony,realityking/symfony,lyrixx/symfony,paradajozsef/symfony,Pierstoval/symfony,michaelperrin/symfony,inso/symfony,paradajozsef/symfony,lstrojny/symfony,apfelbox/symfony,ewgRa/symfony,shieldo/symfony,SpacePossum/symfony,pix-art/symfony,HeahDude/symfony,romainneutron/symfony,phramz/symfony,pamil/symfony,WhiteEagle88/symfony,mpdude/symfony,tronsha/symfony,zerustech/symfony,believer-ufa/symfony,tgalopin/symfony,romainneutron/symfony,WouterJ/symfony,jjanvier/symfony,Triiistan/symfony,MisatoTremor/symfony,gnat42/symfony,Slamdunk/symfony,hiddewie/symfony,pyrech/symfony,GuilhemN/symfony,frankdejonge/symfony,nicolas-grekas/symfony,chrisguitarguy/symfony,mihai-stancu/symfony,havvg/symfony,lyrixx/symfony,k0pernikus/symfony,OskarStark/symfony,weaverryan/symfony,iltar/symfony,e-moe/symfony,arjenm/symfony,voronkovich/symfony,georaldc/symfony,codeclimate-testing/symfony,zcodes/symfony,zorn-v/symfony,andrerom/symfony,WouterJ/symfony,phramz/symfony,dzuelke/symfony,jakzal/symfony,csarrazi/symfony,mnapoli/symfony,d-ph/symfony,unexge/symfony,mihai-stancu/symfony,MatTheCat/symfony,apfelbox/symfony,WhiteEagle88/symfony,geoffrey-brier/symfony,mweimerskirch/symfony,csarrazi/symfony,backbone87/symfony,derrabus/symfony,hiddewie/symfony,ogizanagi/symfony,localheinz/symfony,nasimnabavi/symfony,curry684/symfony,GuilhemN/symfony,Ener-Getick/symfony,jpauli/symfony,zerustech/symfony,tucksaun/symfony,ajgarlag/symfony,codeclimate-testing/symfony,localheinz/symfony,sgehrig/symfony,Pierstoval/symfony,andreia/symfony,SaschaDens/symfony,symfony/symfony,gonzalovilaseca/symfony,1ed/symfony,havvg/symfony,apetitpa/symfony,Ener-Getick/symfony,pix-art/symfony,garak/symfony,jean-gui/symfony,mvhirsch/symfony,jakubsacha/symfony,kbond/symfony,Soullivaneuh/symfony,mvhirsch/symfony,jpauli/symfony,dunglas/symfony,believer-ufa/symfony,1ed/symfony,mickaelandrieu/symfony,pamil/symfony,Padam87/symfony,tgalopin/symfony,apfelbox/symfony,jjanvier/symfony,Padam87/symfony,inso/symfony,patrick-mcdougle/symfony,zcodes/symfony,sgehrig/symfony,danionut90/symfony,mweimerskirch/symfony,Deamon/symfony,mpdude/symfony,arjenm/symfony,aeoris/symfony,andrerom/symfony,Triiistan/symfony,deguif/symfony,apetitpa/symfony,kbond/symfony,Deamon/symfony,HeahDude/symfony,mickaelandrieu/symfony,Deamon/symfony,lepiaf/symfony,lemoinem/symfony,sstok/symfony,romainneutron/symfony,curry684/symfony,ewgRa/symfony,yceruto/symfony,Strate/symfony,ogizanagi/symfony,Koc/symfony,d-ph/symfony,klandaika/symfony,okdana/symfony,shieldo/symfony,OndraM/symfony,kbond/symfony,Einenlum/symfony,romaricdrigon/symfony,DavidGarciaCat/symfony,apfelbox/symfony,gimler/symfony,tronsha/symfony,natechicago/symfony,codeclimate-testing/symfony,garak/symfony,zerustech/symfony,sstok/symfony,Soullivaneuh/symfony,d-ph/symfony,unexge/symfony,sgehrig/symfony,Padam87/symfony,sroze/symfony,jakubsacha/symfony,jpauli/symfony,GuilhemN/symfony,andreia/symfony,apetitpa/symfony,DavidGarciaCat/symfony,georaldc/symfony,lyrixx/symfony,Pierstoval/symfony,smatyas/symfony,alekitto/symfony,inso/symfony,docteurklein/symfony,teohhanhui/symfony,dosten/symfony,jean-gui/symfony,Nyholm/symfony,jameshalsall/symfony,Taluu/symfony,tgalopin/symfony,tronsha/symfony,jameshalsall/symfony,ro0NL/symfony,phramz/symfony,chalasr/symfony,nicolas-grekas/symfony,ewgRa/symfony,danionut90/symfony,SpacePossum/symfony,teohhanhui/symfony,deguif/symfony,hhamon/symfony,OskarStark/symfony,chalasr/symfony,csarrazi/symfony,localheinz/symfony,c960657/symfony,georaldc/symfony,jderusse/symfony,Ener-Getick/symfony,Deamon/symfony,michaelperrin/symfony,k0pernikus/symfony,zorn-v/symfony,fabpot/symfony,Koc/symfony,oleg-andreyev/symfony,Slamdunk/symfony,chalasr/symfony,docteurklein/symfony,Aliance/symfony,zcodes/symfony,chrisguitarguy/symfony,lepiaf/symfony,symfony/symfony,sroze/symfony,jakubsacha/symfony,chrisguitarguy/symfony,pamil/symfony,SpacePossum/symfony,jameshalsall/symfony,ajgarlag/symfony,vincentaubert/symfony,dzuelke/symfony,neemzy/symfony,jjanvier/symfony,e-moe/symfony,tronsha/symfony,romaricdrigon/symfony,stof/symfony,stof/symfony,dbu/symfony,klandaika/symfony,garak/symfony,zerkms/symfony,tgalopin/symfony,damienalexandre/symfony,gencer/symfony,natechicago/symfony,OskarStark/symfony,pix-art/symfony,mpdude/symfony,hacfi/symfony,jderusse/symfony,Amo/symfony,docteurklein/symfony,believer-ufa/symfony,zerkms/symfony,stof/symfony,stof/symfony,zerkms/symfony,dmaicher/symfony,Nyholm/symfony,dzuelke/symfony,dbu/symfony,gimler/symfony,OndraM/symfony,hiddewie/symfony,sstok/symfony,neemzy/symfony,nasimnabavi/symfony,hason/symfony,kbond/symfony,jakubsacha/symfony,ewgRa/symfony,tucksaun/symfony,Engerim/symfony,sroze/symfony,mickaelandrieu/symfony,smatyas/symfony,ro0NL/symfony,yceruto/symfony,mpdude/symfony,geoffrey-brier/symfony,natechicago/symfony,havvg/symfony,unexge/symfony,pyrech/symfony,josephdpurcell/symfony,jakzal/symfony,Simperfit/symfony,pyrech/symfony,jvasseur/symfony,Soullivaneuh/symfony,Amo/symfony,gencer/symfony,SpacePossum/symfony,danionut90/symfony,MisatoTremor/symfony,danionut90/symfony,Koc/symfony,danionut90/symfony,dosten/symfony,dunglas/symfony,voronkovich/symfony,SaschaDens/symfony,joelwurtz/symfony,lepiaf/symfony,hason/symfony,oleg-andreyev/symfony,havvg/symfony,jzawadzki/symfony,derrabus/symfony,michaelperrin/symfony,josephdpurcell/symfony,Koc/symfony,neemzy/symfony,Simperfit/symfony,c960657/symfony,patrick-mcdougle/symfony,weaverryan/symfony,pierredup/symfony,dunglas/symfony,jvasseur/symfony,andreia/symfony,chrisguitarguy/symfony,pyrech/symfony,jderusse/symfony,mweimerskirch/symfony,geoffrey-brier/symfony,WouterJ/symfony,MatTheCat/symfony,ragboyjr/symfony,Slamdunk/symfony,georaldc/symfony,teohhanhui/symfony,ragboyjr/symfony,mickaelandrieu/symfony,inso/symfony,gonzalovilaseca/symfony,jvasseur/symfony,mihai-stancu/symfony,fabpot/symfony,MisatoTremor/symfony,MatTheCat/symfony,chrisguitarguy/symfony,symfony/symfony,Padam87/symfony,klandaika/symfony,nasimnabavi/symfony,hason/symfony,tronsha/symfony,gnat42/symfony,pix-art/symfony,1ed/symfony,dmaicher/symfony,gimler/symfony,alekitto/symfony,zcodes/symfony,OskarStark/symfony,sstok/symfony,vincentaubert/symfony,zorn-v/symfony,apetitpa/symfony,jpauli/symfony,mnapoli/symfony,OndraM/symfony,WhiteEagle88/symfony,arjenm/symfony,dosten/symfony,chalasr/symfony,yceruto/symfony,mweimerskirch/symfony,Slamdunk/symfony,gimler/symfony,jjanvier/symfony,docteurklein/symfony,georaldc/symfony,ajgarlag/symfony,geoffrey-brier/symfony,GuilhemN/symfony,alekitto/symfony,Simperfit/symfony,dzuelke/symfony,Taluu/symfony,d-ph/symfony,Deamon/symfony,backbone87/symfony,iltar/symfony,dosten/symfony,andreia/symfony,docteurklein/symfony,natechicago/symfony,Engerim/symfony,danionut90/symfony,ragboyjr/symfony,Padam87/symfony,realityking/symfony,tronsha/symfony,jzawadzki/symfony,maidmaid/symfony,arjenm/symfony,bendavies/symfony,dzuelke/symfony,gnat42/symfony,GuilhemN/symfony,hacfi/symfony,okdana/symfony,tucksaun/symfony,damienalexandre/symfony,k0pernikus/symfony,gencer/symfony,Ener-Getick/symfony,realityking/symfony,unexge/symfony,Soullivaneuh/symfony,localheinz/symfony,Tobion/symfony,dmaicher/symfony,zerustech/symfony,Triiistan/symfony,deguif/symfony,paradajozsef/symfony,maidmaid/symfony,ajgarlag/symfony,lemoinem/symfony,MatTheCat/symfony,bendavies/symfony,mnapoli/symfony,Taluu/symfony,okdana/symfony,Simperfit/symfony,patrick-mcdougle/symfony,jpauli/symfony,voronkovich/symfony,hhamon/symfony,dbu/symfony,jpauli/symfony,c960657/symfony,SaschaDens/symfony,smatyas/symfony,dbu/symfony,k0pernikus/symfony