SQL Reference page's "JOINs" section is misleading/lacking

In the JOINs section of the SQL Reference page, the only method mentioned is "dot notation". The examples compare a typical SQL join of two different tables to the OrientDB concept of accessing an object that is linked with a LINK property from the parent object. First, to a new reader, it's not exactly clear that that is what's happening, so I think a quick schema definition of the classes involved would help a lot there. Second, accessing related vertices via edges is not mentioned. I think it would be tremendously helpful to at least link to the functions that allow a query to traverse edges, such as in(), out(), and both().

Start with the JOINs section of the linked SQL Reference page. Clarify the schema behind the dot-notation examples and add links to the in(), out(), and both() functions; done means the section explains the relationship model and points readers to edge traversal.