TDAI — DDS PSM Topic types for PIM Method unclear

It is not totally clear how an implementer uses (invokes, implements) a PIM method within the DDS/IDL PSM.

Add Comments to Topic Type Definition to emphasise their role

Add comments to each generated topic type from a method signature (as per section 12.1) to state that it is intended as a DDS Topic type, maps to the original PIM method and is used through publication to invoke or subscription to implement.

For each topic type insert (prepend) at the head of the comment block
"This is the DDS Topic type for invoking and implementing the {@Operation} method on the {@Interface} interface.
To invoke the operation publish a DDS Sample of this type; to implement it subscribe for samples."