Fix typo: update footer year to 2023#511

aaayu-07 wants to merge 1 commit intoibm-developer-skills-network:mainibm-developer-skills-network/mcino-Introduction-to-Git-and-GitHub:mainfrom

aaayu-07:bug-fix-typoaaayu-07/mcino-Introduction-to-Git-and-GitHub:bug-fix-typoCopy head branch name to clipboard