[Docs] Fix minor typo in usage.md

[agrath]

Minor documentation fix (edit spelling error)

[dnfadmin]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

❌ agrath sign now
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[agrath]

Tried to sign the CLA per link above and got an error

[alexeyzimarev]

Hm, the CLA comes from .NET Foundation, I have to check with them.