Documentarian Bob Smeaton has done well by himself and his subject, the late Jimi Hendrix, in Jimi Hendrix: Hear My Train A’Comin’ (PBS, 11.5). He’s delivered a stirring, well-crafted valentine — a two-hour portrait of a much-worshipped, gentle-mannered, extremely modest genius who loved the ladies and was obsessively devoted to playing guitar. Which is all true as far as it goes. But this is a project controlled by the Hendrix family (i.e., Experience Hendrix, LLC), and if you know anything about this notoriously conservative-minded bunch you know what that means. Almost all the details about Jimi Hendrix’s short life that allude to any kind of subterranean undertow or inclination (such as the ingestion of psychedelic drugs) have been pretty much scrubbed out.