Fix: corrected formula and formatting in README.md#43218

Katlego-Ram2 wants to merge 1 commit intoibm-developer-skills-network:masteribm-developer-skills-network/jbbmo-Introduction-to-Git-and-GitHub:masterfrom

Katlego-Ram2:fix-markdown-typoKatlego-Ram2/jbbmo-Introduction-to-Git-and-GitHub:fix-markdown-typoCopy head branch name to clipboard