Fix: update footer year to 2023#1836

Darpan225 wants to merge 1 commit intoibm-developer-skills-network:mainibm-developer-skills-network/mcino-Introduction-to-Git-and-GitHub:mainfrom

Darpan225:bug-fix-typoDarpan225/mcino-Introduction-to-Git-and-GitHub:bug-fix-typoCopy head branch name to clipboard