We will add an explanation about what this section is for - namely that it's a list of the CDA document types that are most likely to be of interest for exchange.  At the moment, this information is only relevant to CDex so we will move it into that IG which will help provide additional context.  Finally, we'll add the LOINC code to use to query for each of the document types so that readers can simply look at the page to find the document type of interest and find all that they need in order to query that document without having to go elsewhere.