adds discussions to automatic-token-authentication page (#51373)

Signed-off-by: Collin McNeese <[email protected]>
Co-authored-by: Siara <[email protected]>

Author: collinmcneese

content/actions/security-guides/automatic-token-authentication.md

@@ -88,6 +88,7 @@ The following table shows the permissions granted to the `GITHUB_TOKEN` by defau
 | checks        | read/write  | none | read |
 | contents      | read/write  | read | read |
 | deployments   | read/write  | none | read |
+| discussions   | read/write  | none | read |
 | {% ifversion fpt or ghec %} |
 | id-token      | none        | none | read |
 | {% endif %} |