Fix documentation for DeleteFile

[HakonSohoel]

Issue
Resolves #8829

• 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 91.40%. Comparing base (4bba695) to head (14d6d31).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8861      +/-   ##
==========================================
+ Coverage   91.35%   91.40%   +0.05%     
==========================================
  Files         343      344       +1     
  Lines       21087    21102      +15     
==========================================
+ Hits        19263    19289      +26     
+ Misses       1824     1813      -11     

Flag	Coverage Δ
cli-tests	39.67% <ø> (+0.09%)	⬆️
gui-tests	73.50% <ø> (+0.01%)	⬆️
performance-tests	50.20% <ø> (+0.03%)	⬆️
unit-tests	79.92% <ø> (+0.04%)	⬆️

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[andreas-el]

Nicely done! 💯