Updated doc/reference_data submodule reference
Updated doc/reference_data submodule reference

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