Add missing token scopes for wireguard oauth

[kprosise]

Info was added to what was assumed to be the appropriate spot; will need to be reviewed, and possibly expanded upon.

QA steps: checked rendered output in browser. Edited doc with linters.

No related issue/task, quick-fix to a Customer Success request.

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[doanac]

Docs for 1b2b9df are browsable at: https://ci.foundries.io/projects/fio-docs/builds/2655/docs/artifacts/html/index.html

[doanac]

good idea .

[caiotpereira]

LGTM