website/docs: expressions: fix markdown (cherry-pick #18613 to version-2025.10)

[authentik-automation]

Cherry-pick of #18613 to version-2025.10 branch.

Original PR: #18613
Original Author: @dominic-r
Cherry-picked commit: 17ef75c

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.94%. Comparing base (36593d4) to head (6857117).
⚠️ Report is 1 commits behind head on version-2025.10.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@               Coverage Diff                @@
##           version-2025.10   #18617   +/-   ##
================================================
  Coverage            92.94%   92.94%           
================================================
  Files                  869      869           
  Lines                48098    48098           
================================================
+ Hits                 44703    44704    +1     
+ Misses                3395     3394    -1     

Flag	Coverage Δ
e2e	45.04% <ø> (+<0.01%)	⬆️
integration	23.11% <ø> (+<0.01%)	⬆️
unit	91.09% <ø> (+<0.01%)	⬆️
unit-migrate	91.14% <ø> (+<0.01%)	⬆️

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[github-actions]

authentik PR Installation instructions

Instructions for docker-compose

Add the following block to your .env file:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-685711726451648dbb619c15b7a2ddf1a1b10473
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

Afterwards, run the upgrade commands from the latest release notes.

Instructions for Kubernetes

Add the following block to your values.yml file:

authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-685711726451648dbb619c15b7a2ddf1a1b10473

Afterwards, run the upgrade commands from the latest release notes.