website/docs: fix API OAuth token usage

[duhast]

JWT Token howto update

Details

I've spent half day figuring out why I can't access Authentik API using "JWT" method mentioned in the doc.
It turned out it is required to supply OAuth access token, not refresh token to make it work.

Hope this update will save time for the others.

REPLACE ME

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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 has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)
• The translation files have been updated (make i18n-extract)

If applicable

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

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (78af350) 92.66% compared to head (2139ac1) 49.55%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #7159       +/-   ##
===========================================
- Coverage   92.66%   49.55%   -43.11%     
===========================================
  Files         568      568               
  Lines       28049    28049               
===========================================
- Hits        25989    13897    -12092     
- Misses       2060    14152    +12092     

Flag	Coverage Δ
e2e	49.55% <ø> (-1.62%)	⬇️
integration	?
unit	?

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see 407 files with indirect coverage changes

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