Update doc to have a arango-root-pwd that works#1768

GregTwinsight wants to merge 1 commit intoarangodb:masterarangodb/kube-arangodb:masterfrom

GregTwinsight:fix-docs-how-to-set-root-user-passwordGregTwinsight/kube-arangodb:fix-docs-how-to-set-root-user-passwordCopy head branch name to clipboard