Currently https://docs.python.org/3.6/library/socket.html#socket-families only says "Certain other address families (AF_BLUETOOTH, AF_PACKET, AF_CAN) support specific representations." and there's a comment in the docs saying "document them!"...  So, I'm documenting the AF_BLUETOOTH.

I'm not sure about which versions this should be added to except for 3.6 so I'm listing the pertinent issues when changes were made: 

issue929192 seems to be where the current address format was added for L2CAP, RFCOMM, and SCO

issue1432399 seems to be where HCI was added

issue5510 seems to be where the alternate address format for HCI was added for NetBSD and DragonFlyBSD

It seems SCO used to accept a regular string but at 23ab586c427a it was changed to use a `bytes`...  I'm not sure the issue behind that.


This is my first contribution to CPython so I figured a patch to the docs would be easiest.  Please let me know if I'm doing anything wrong!