Duplicate list item for keyref attribute #955
Description
In 2.0 draft spec, https://github.com/oasis-tcs/dita/blob/DITA-2.0/specification/langRef/quick-reference/base-attributes-a-to-z.dita#L44 has <sli><xref keyref="attributes-common/attr-keyref"/></sli> twice.