(doc) add documentation line for RMS framewise displacement following Jenkinson (2002)
(doc) add documentation line for RMS framewise displacement following Jenkinson (2002)

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