While working on #FHIR-22666 to improve the description of the source input parameter for the $translate operation, some existing text is removed. Folks thought the removed text is valuable, but not appropriate for the R4 location.

It was suggested that this text (or some version of it) be added to the operation description.

May be a logical id, or an absolute or relative location. The source value set is an optional parameter because in some cases, the client cannot know what the source value set is. However, without a source value set, the server may be unable to safely identify an applicable concept map, and would return an error. For this reason, a source value set SHOULD always be provided. Note that servers may be able to identify an appropriate concept map without a source value set if there is a full mapping for the entire code system in the concept map, or by manual intervention