Added note about line vs cell magics
Added note about line vs cell magics

basnijholt/holoviews,ioam/holoviews,vascotenner/holoviews,basnijholt/holoviews,basnijholt/holoviews,vascotenner/holoviews,ioam/holoviews,vascotenner/holoviews,mjabri/holoviews,mjabri/holoviews,ioam/holoviews,mjabri/holoviews