Fix a typo in readme.  Fix ascii art not rendering right
Fix a typo in readme.  Fix ascii art not rendering right

fipar/linkbenchX,jexp/linkbench,alexaverbuch/linkbench,facebook/linkbench,rotemfogel/linkbench,foumacray/gs2,jdellithorpe/linkbench,rotemfogel/linkbench,3manuek/linkbench,facebook/linkbench,fipar/linkbenchX,alexaverbuch/linkbench,facebookarchive/linkbench,foumacray/gs2,yonglehou/linkbench,yonglehou/linkbench,jexp/linkbench,jdellithorpe/linkbench,3manuek/linkbench,dbpercona/linkbenchX,facebookarchive/linkbench,dbpercona/linkbenchX,Percona-Lab/linkbenchX,Percona-Lab/linkbenchX