Block Diagrams: Tweak FMCOMMS2 based on feedback from Wyatt

Signed-of-by: Robin Getz <Robin.Getz@analog.com>
Block Diagrams : FMCOMMS2 : remove "PLL" from the PLLs per request

Signed-off-by : Robin Getz <Robin.Getz@analog.com>
Block Diagrams: Add jpg of the FMCOMMS2 Card

Signed-off-by: Robin Getz <Robin.Getz@analog.com>
Block Diagrams: Have the abilty to use more than one "Diagram" to
provide pictures of what people are looking for

Signed-off-by: Robin Getz <Robin.Getz@analog.com>