fix documentation about node version
What does this MR do?
Changes the docs and fixes the node version to the correct minimal node version.
Why was this MR needed?
Maintainers would run into this issue, and the documentation is currently misleading.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend -
Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together -
Internationalization required/considered -
End-to-end tests pass ( package-qamanual pipeline job)
What are the relevant issue numbers?
Edited by Tobias Gurtzick