Fix typo

[hubwriter]

What article on docs.github.com is affected?

https://docs.github.com/en/github/setting-up-and-managing-billing-and-payments-on-github/renewing-your-clients-paid-organization

What part(s) of the article would you like to see updated?

Change "manger" to "manager" in:

"If you're not a billing manger for the organization, ask your client to have an owner of the organization add you to the organization as a billing manager."

in this reusable source file: https://github.com/github/docs/blob/main/data/reusables/organizations/reseller-ask-to-become-billing-manager.md

Additional information