Fix typo in hadd --help (misspelling of -cachesize.
Fix typo in hadd --help (misspelling of -cachesize.

See https://root-forum.cern.ch/t/typo-in-hadd-flags/24131/1

mhuwiler/rootauto,beniz/root,beniz/root,satyarth934/root,simonpf/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,BerserkerTroll/root,karies/root,agarciamontoro/root,simonpf/root,olifre/root,root-mirror/root,davidlt/root,bbockelm/root,buuck/root,karies/root,karies/root,simonpf/root,bbockelm/root,mhuwiler/rootauto,davidlt/root,zzxuanyuan/root,bbockelm/root,zzxuanyuan/root-compressor-dummy,mhuwiler/rootauto,beniz/root,olifre/root,beniz/root,BerserkerTroll/root,bbockelm/root,olifre/root,BerserkerTroll/root,buuck/root,satyarth934/root,agarciamontoro/root,zzxuanyuan/root-compressor-dummy,root-mirror/root,root-mirror/root,buuck/root,root-mirror/root,buuck/root,simonpf/root,karies/root,abhinavmoudgil95/root,abhinavmoudgil95/root,abhinavmoudgil95/root,zzxuanyuan/root,root-mirror/root,zzxuanyuan/root,davidlt/root,beniz/root,bbockelm/root,agarciamontoro/root,mhuwiler/rootauto,BerserkerTroll/root,zzxuanyuan/root-compressor-dummy,mhuwiler/rootauto,beniz/root,buuck/root,mhuwiler/rootauto,satyarth934/root,abhinavmoudgil95/root,simonpf/root,davidlt/root,satyarth934/root,karies/root,BerserkerTroll/root,davidlt/root,simonpf/root,BerserkerTroll/root,karies/root,bbockelm/root,BerserkerTroll/root,beniz/root,agarciamontoro/root,zzxuanyuan/root-compressor-dummy,buuck/root,olifre/root,BerserkerTroll/root,zzxuanyuan/root-compressor-dummy,davidlt/root,olifre/root,zzxuanyuan/root,root-mirror/root,satyarth934/root,beniz/root,root-mirror/root,abhinavmoudgil95/root,olifre/root,olifre/root,buuck/root,abhinavmoudgil95/root,zzxuanyuan/root,BerserkerTroll/root,simonpf/root,olifre/root,buuck/root,karies/root,abhinavmoudgil95/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,buuck/root,mhuwiler/rootauto,beniz/root,simonpf/root,bbockelm/root,zzxuanyuan/root,zzxuanyuan/root,mhuwiler/rootauto,zzxuanyuan/root,simonpf/root,mhuwiler/rootauto,beniz/root,root-mirror/root,olifre/root,satyarth934/root,buuck/root,agarciamontoro/root,mhuwiler/rootauto,abhinavmoudgil95/root,bbockelm/root,beniz/root,davidlt/root,satyarth934/root,BerserkerTroll/root,zzxuanyuan/root-compressor-dummy,davidlt/root,root-mirror/root,root-mirror/root,karies/root,bbockelm/root,zzxuanyuan/root-compressor-dummy,davidlt/root,karies/root,satyarth934/root,satyarth934/root,zzxuanyuan/root,karies/root,root-mirror/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,satyarth934/root,olifre/root,abhinavmoudgil95/root,zzxuanyuan/root-compressor-dummy,bbockelm/root,davidlt/root,zzxuanyuan/root,agarciamontoro/root,karies/root,mhuwiler/rootauto,olifre/root,agarciamontoro/root,bbockelm/root,buuck/root,zzxuanyuan/root,abhinavmoudgil95/root,davidlt/root,satyarth934/root,agarciamontoro/root,simonpf/root,BerserkerTroll/root,simonpf/root,zzxuanyuan/root,abhinavmoudgil95/root