[ROOT-2747] Fixed comments in TGeoVolume.cxx for the reference guide
[ROOT-2747] Fixed comments in TGeoVolume.cxx for the reference guide

(cherry picked from commit 21a16dc056d9868986138e2329a134baa4d647cb)

mhuwiler/rootauto,davidlt/root,gbitzes/root,esakellari/root,gganis/root,jrtomps/root,perovic/root,gbitzes/root,zzxuanyuan/root,gbitzes/root,root-mirror/root,sirinath/root,0x0all/ROOT,bbockelm/root,krafczyk/root,mattkretz/root,smarinac/root,buuck/root,gbitzes/root,beniz/root,dfunke/root,mhuwiler/rootauto,Duraznos/root,pspe/root,krafczyk/root,perovic/root,omazapa/root-old,satyarth934/root,beniz/root,esakellari/root,karies/root,omazapa/root,georgtroska/root,zzxuanyuan/root,CristinaCristescu/root,0x0all/ROOT,Duraznos/root,bbockelm/root,gganis/root,sirinath/root,mkret2/root,zzxuanyuan/root,esakellari/my_root_for_test,Duraznos/root,sirinath/root,sawenzel/root,pspe/root,lgiommi/root,omazapa/root,nilqed/root,Y--/root,Y--/root,abhinavmoudgil95/root,0x0all/ROOT,georgtroska/root,nilqed/root,agarciamontoro/root,esakellari/root,omazapa/root-old,thomaskeck/root,esakellari/my_root_for_test,davidlt/root,bbockelm/root,BerserkerTroll/root,olifre/root,simonpf/root,mattkretz/root,mattkretz/root,zzxuanyuan/root,pspe/root,bbockelm/root,zzxuanyuan/root,evgeny-boger/root,georgtroska/root,zzxuanyuan/root,smarinac/root,olifre/root,arch1tect0r/root,root-mirror/root,lgiommi/root,davidlt/root,gganis/root,root-mirror/root,mattkretz/root,abhinavmoudgil95/root,thomaskeck/root,dfunke/root,arch1tect0r/root,thomaskeck/root,BerserkerTroll/root,abhinavmoudgil95/root,BerserkerTroll/root,zzxuanyuan/root-compressor-dummy,satyarth934/root,lgiommi/root,simonpf/root,lgiommi/root,krafczyk/root,zzxuanyuan/root,sbinet/cxx-root,davidlt/root,krafczyk/root,esakellari/my_root_for_test,dfunke/root,veprbl/root,Duraznos/root,sirinath/root,sawenzel/root,omazapa/root,davidlt/root,omazapa/root,esakellari/root,Y--/root,thomaskeck/root,Y--/root,abhinavmoudgil95/root,mattkretz/root,nilqed/root,smarinac/root,veprbl/root,pspe/root,omazapa/root,dfunke/root,jrtomps/root,abhinavmoudgil95/root,bbockelm/root,simonpf/root,esakellari/root,Y--/root,evgeny-boger/root,root-mirror/root,sirinath/root,sirinath/root,perovic/root,vukasinmilosevic/root,perovic/root,georgtroska/root,karies/root,gganis/root,mkret2/root,jrtomps/root,vukasinmilosevic/root,perovic/root,satyarth934/root,agarciamontoro/root,omazapa/root-old,olifre/root,arch1tect0r/root,omazapa/root-old,CristinaCristescu/root,satyarth934/root,Y--/root,vukasinmilosevic/root,evgeny-boger/root,mkret2/root,veprbl/root,nilqed/root,omazapa/root-old,esakellari/root,esakellari/my_root_for_test,sirinath/root,mattkretz/root,krafczyk/root,buuck/root,perovic/root,zzxuanyuan/root,mkret2/root,sawenzel/root,satyarth934/root,pspe/root,dfunke/root,lgiommi/root,evgeny-boger/root,beniz/root,gbitzes/root,root-mirror/root,lgiommi/root,olifre/root,mkret2/root,veprbl/root,esakellari/root,agarciamontoro/root,krafczyk/root,buuck/root,esakellari/my_root_for_test,evgeny-boger/root,gganis/root,nilqed/root,krafczyk/root,smarinac/root,gbitzes/root,thomaskeck/root,dfunke/root,perovic/root,jrtomps/root,mkret2/root,CristinaCristescu/root,satyarth934/root,BerserkerTroll/root,gganis/root,sirinath/root,olifre/root,jrtomps/root,root-mirror/root,thomaskeck/root,vukasinmilosevic/root,sawenzel/root,krafczyk/root,beniz/root,pspe/root,bbockelm/root,davidlt/root,arch1tect0r/root,root-mirror/root,georgtroska/root,georgtroska/root,CristinaCristescu/root,Duraznos/root,perovic/root,mkret2/root,BerserkerTroll/root,veprbl/root,vukasinmilosevic/root,sbinet/cxx-root,nilqed/root,sbinet/cxx-root,jrtomps/root,jrtomps/root,krafczyk/root,mattkretz/root,zzxuanyuan/root-compressor-dummy,zzxuanyuan/root-compressor-dummy,veprbl/root,omazapa/root-old,Y--/root,gbitzes/root,olifre/root,mhuwiler/rootauto,omazapa/root,karies/root,BerserkerTroll/root,simonpf/root,lgiommi/root,nilqed/root,Duraznos/root,davidlt/root,sbinet/cxx-root,karies/root,simonpf/root,buuck/root,simonpf/root,esakellari/my_root_for_test,BerserkerTroll/root,arch1tect0r/root,omazapa/root,smarinac/root,smarinac/root,thomaskeck/root,Duraznos/root,buuck/root,georgtroska/root,veprbl/root,esakellari/my_root_for_test,simonpf/root,beniz/root,gganis/root,olifre/root,veprbl/root,abhinavmoudgil95/root,davidlt/root,bbockelm/root,0x0all/ROOT,esakellari/my_root_for_test,nilqed/root,mkret2/root,georgtroska/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,CristinaCristescu/root,sbinet/cxx-root,thomaskeck/root,jrtomps/root,karies/root,jrtomps/root,mattkretz/root,CristinaCristescu/root,zzxuanyuan/root-compressor-dummy,evgeny-boger/root,gganis/root,esakellari/my_root_for_test,veprbl/root,satyarth934/root,mhuwiler/rootauto,nilqed/root,sawenzel/root,esakellari/my_root_for_test,smarinac/root,dfunke/root,thomaskeck/root,vukasinmilosevic/root,lgiommi/root,mhuwiler/rootauto,BerserkerTroll/root,beniz/root,sbinet/cxx-root,CristinaCristescu/root,0x0all/ROOT,omazapa/root,sirinath/root,zzxuanyuan/root-compressor-dummy,buuck/root,davidlt/root,satyarth934/root,gganis/root,CristinaCristescu/root,agarciamontoro/root,esakellari/root,mhuwiler/rootauto,lgiommi/root,lgiommi/root,root-mirror/root,esakellari/root,evgeny-boger/root,lgiommi/root,pspe/root,abhinavmoudgil95/root,buuck/root,pspe/root,beniz/root,sawenzel/root,bbockelm/root,sbinet/cxx-root,veprbl/root,mhuwiler/rootauto,simonpf/root,Y--/root,satyarth934/root,beniz/root,sirinath/root,krafczyk/root,zzxuanyuan/root,simonpf/root,veprbl/root,abhinavmoudgil95/root,vukasinmilosevic/root,perovic/root,omazapa/root-old,olifre/root,jrtomps/root,bbockelm/root,evgeny-boger/root,sawenzel/root,zzxuanyuan/root,beniz/root,arch1tect0r/root,0x0all/ROOT,dfunke/root,karies/root,smarinac/root,karies/root,zzxuanyuan/root-compressor-dummy,arch1tect0r/root,buuck/root,arch1tect0r/root,vukasinmilosevic/root,agarciamontoro/root,CristinaCristescu/root,georgtroska/root,abhinavmoudgil95/root,omazapa/root-old,agarciamontoro/root,karies/root,smarinac/root,Duraznos/root,evgeny-boger/root,vukasinmilosevic/root,sawenzel/root,olifre/root,mhuwiler/rootauto,beniz/root,Y--/root,Duraznos/root,omazapa/root,arch1tect0r/root,root-mirror/root,mkret2/root,bbockelm/root,esakellari/root,satyarth934/root,sawenzel/root,abhinavmoudgil95/root,gganis/root,zzxuanyuan/root-compressor-dummy,omazapa/root,buuck/root,CristinaCristescu/root,perovic/root,evgeny-boger/root,nilqed/root,zzxuanyuan/root,agarciamontoro/root,bbockelm/root,buuck/root,omazapa/root-old,gbitzes/root,satyarth934/root,vukasinmilosevic/root,Duraznos/root,karies/root,mhuwiler/rootauto,agarciamontoro/root,omazapa/root,dfunke/root,sawenzel/root,sbinet/cxx-root,sbinet/cxx-root,zzxuanyuan/root-compressor-dummy,nilqed/root,krafczyk/root,mkret2/root,sbinet/cxx-root,gganis/root,pspe/root,arch1tect0r/root,BerserkerTroll/root,CristinaCristescu/root,pspe/root,georgtroska/root,gbitzes/root,karies/root,vukasinmilosevic/root,evgeny-boger/root,olifre/root,zzxuanyuan/root-compressor-dummy,Duraznos/root,sawenzel/root,gbitzes/root,zzxuanyuan/root-compressor-dummy,smarinac/root,BerserkerTroll/root,root-mirror/root,Y--/root,mhuwiler/rootauto,mattkretz/root,simonpf/root,olifre/root,0x0all/ROOT,omazapa/root-old,perovic/root,agarciamontoro/root,0x0all/ROOT,arch1tect0r/root,Y--/root,georgtroska/root,abhinavmoudgil95/root,karies/root,zzxuanyuan/root,BerserkerTroll/root,pspe/root,dfunke/root,root-mirror/root,beniz/root,mattkretz/root,mhuwiler/rootauto,agarciamontoro/root,davidlt/root,thomaskeck/root,jrtomps/root,0x0all/ROOT,simonpf/root,gbitzes/root,buuck/root,omazapa/root-old,dfunke/root,mattkretz/root,sirinath/root,davidlt/root,esakellari/root,sbinet/cxx-root,mkret2/root