Return reference node for something like ``:chpl:chplref:``.

def _make_refnode(self, fromdocname, builder, docname, labelid, sectname,
                      contnode, **kwargs):
        """Return reference node for something like ``:chpl:chplref:``."""
        nodeclass = kwargs.pop('nodeclass', nodes.reference)
        newnode = nodeclass('', '', internal=True, **kwargs)
        innernode = nodes.emphasis(sectname, sectname)
        if docname == fromdocname:
            newnode['refid'] = labelid
        else:
            # Set more info on contnode. In case the get_relative_uri call
            # raises NoUri, the builder will then have to resolve these.
            contnode = addnodes.pending_xref('')
            contnode['refdocname'] = docname
            contnode['refsectname'] = sectname
            newnode['refuri'] = builder.get_relative_uri(fromdocname, docname)
            if labelid:
                newnode['refuri'] += '#' + labelid
        newnode.append(innernode)
        return newnode