doc: add missing permission for group access token

Christian Schymarequested to merge
csym/doc:master into master

Presentation

Fixes #34 (closed)

Checklist

Tested on-premise only.

  • Documented:
    • README.md reflects any job, variable or whichever visible change
    • kicker.json reflects any job, variable or whichever visible change
  • Tested & examplified:
    • (url to a project sample successfully proving the merge request fixes the issue)

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