Add reference to refcase section in summary keyword

[oyvindeide]

Update documentation

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.67%. Comparing base (9817d75) to head (123b176).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9064      +/-   ##
==========================================
- Coverage   90.70%   90.67%   -0.03%     
==========================================
  Files         349      349              
  Lines       21776    21776              
==========================================
- Hits        19751    19746       -5     
- Misses       2025     2030       +5     

Flag	Coverage Δ
cli-tests	38.97% <ø> (-0.01%)	⬇️
gui-tests	71.67% <ø> (-0.03%)	⬇️
performance-tests	49.27% <ø> (+0.02%)	⬆️
unit-tests	79.53% <ø> (-0.01%)	⬇️

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