Add information about GitHub Token

[mishmanners]

This isn't common knowledge and a bunch of us tried to get this sorted and trouble shoot it ourselves before we released the stuff about the personal token. These couple of lines with links to the official documentation will help prevent this in future 😄

[mishmanners]

Thanks @bdougie for this. I certainly think this should be part of all GitHub Actions that need access tokens. Not assuming knowledge is always a good thing 😉

[bdougie]

LGTM. Thanks for adding this @mishmanners

[mishmanners]

Thanks! We might have a slightly better way to do this!