fix nipype example

[Remi-Gau]

tempted to leave the testing of the nipype example out of this PR and trying to fix it in a separate one though I suspect this will be more efficiently tackled by solving other problems we have

so I would recommend commenting out this example from the doc for now so as to not confuse users

Originally posted by @Remi-Gau in #569 (comment)

[github-actions]

This issue is stale because it has been open for 30 days with no activity.