fix documentation build (for some reason, it works locally)
fix documentation build (for some reason, it works locally)

poldracklab/fmriprep,poldracklab/preprocessing-workflow,oesteban/fmriprep,poldracklab/fmriprep,oesteban/fmriprep,oesteban/preprocessing-workflow,poldracklab/fmriprep,poldracklab/preprocessing-workflow,oesteban/fmriprep,oesteban/preprocessing-workflow