Fix typo in "Covenent"

[kayleachampion]

The word "Covenant" is misspelled as "Covenent" in the paragraph under the "Code of Conduct" heading in the CONTRIBUTING.md file and should be corrected.

[rayaparsa-a11y]

I would like to work on this please!

[github-actions]

Great! I assigned you (@rayaparsa-a11y) to the issue. Have fun working on it!