website/docs: add group matching mode step to discord role sync instructions

[Benricheson101]

Details

The docs example for syncing Discord roles to authentik groups leaves out that you must change "group matching mode" to "link to a group with identical name" for groups to be applied.

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema and clients have been updated (make gen)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make docs)

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[netlify]

✅ Deploy Preview for authentik-docs ready!

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[dewi-tik]

Thanks Ben!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.20%. Comparing base (cc976ad) to head (fb4ed59).
⚠️ Report is 95 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22508      +/-   ##
==========================================
- Coverage   93.28%   93.20%   -0.09%     
==========================================
  Files        1032     1032              
  Lines       60062    60062              
  Branches      400      400              
==========================================
- Hits        56029    55978      -51     
- Misses       4033     4084      +51     

Flag	Coverage Δ
conformance	36.61% <ø> (+0.14%)	⬆️
e2e	40.85% <ø> (-1.01%)	⬇️
integration	32.56% <ø> (-0.50%)	⬇️
rust	0.00% <ø> (ø)
unit	92.20% <ø> (+<0.01%)	⬆️
unit-migrate	92.25% <ø> (+<0.01%)	⬆️

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