Updated docs for DOMImported#convertContainer.
Updated docs for DOMImported#convertContainer.

andene/substance,jacwright/substance,andene/substance,stencila/substance,substance/substance,podviaznikov/substance,TypesetIO/substance,TypesetIO/substance,podviaznikov/substance,jacwright/substance,abhaga/substance,michael/substance-1,michael/substance-1,abhaga/substance,substance/substance