mediawiki: fix default value of `mediawikiName` in README.md
mediawiki: fix default value of `mediawikiName` in README.md

barklyprotects/charts,kachkaev/charts,krallistic/charts,viglesiasce/charts,trobert2/charts-1,samisms/charts,GaneshSPatil/charts,smileisak/charts,caiwenhao/charts,kachkaev/charts,lachie83/charts,sstarcher/charts,plytro/charts,mluedke/charts,DevOpsify/charts,sd2k/charts,caiwenhao/charts,rimusz/helm-charts,ledor473/charts,escardin/charts,DevOpsify/charts,ledor473/charts,sstarcher/charts,oleh-ozimok/charts,mlaccetti/charts,grugnog/charts,jainishshah17/charts,viglesiasce/charts,krallistic/charts,barklyprotects/charts,GaneshSPatil/charts,GaneshSPatil/charts,smelchior/charts,trobert2/charts-1,viglesiasce/charts,eicnix/charts,smileisak/charts,lachie83/charts,escardin/charts,mluedke/charts,trobert2/charts-1,mluedke/charts,pfeodrippe/charts,pfeodrippe/charts,pfeodrippe/charts,samisms/charts,DevOpsify/charts,smelchior/charts,rimusz/helm-charts,lachie83/charts,rimusz/helm-charts,kachkaev/charts,mlaccetti/charts,ledor473/charts,grugnog/charts,sstarcher/charts,mlaccetti/charts,rimusz/helm-charts,oleh-ozimok/charts,sd2k/charts,sd2k/charts,sd2k/charts,eicnix/charts,jainishshah17/charts,GaneshSPatil/charts,caiwenhao/charts,lachie83/charts,grugnog/charts,smileisak/charts,smelchior/charts,escardin/charts,plytro/charts,pfeodrippe/charts,jainishshah17/charts,helm/charts,helm/charts,barklyprotects/charts,helm/charts,oleh-ozimok/charts,krallistic/charts,samisms/charts,eicnix/charts,helm/charts,DevOpsify/charts