Fix calls to the getEndingNotes method in the samples

[WouterSioen]

Description

This method call required both an array of writes and the filename, which was
missing in two method calls.

Checklist:

• I have run composer run-script check --timeout=0 and no errors were reported
• The new code is covered by unit tests (check build/coverage for coverage report)
• I have update the documentation to describe the changes

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I could not really check the last two items on the checklist since they are not really relevant.

[WouterSioen]

Build failure seems unrelated to my changes, do I re-push my commit to trigger a new build?