just wanna point out that in the Farseer Manual - Angle Joint you state:
"To the left you see a green rectangle that is kept at a specific angle all the time. It can't rotate, only move. A fixed angle joint is used to achieve this."
it's however also possible to make a body non-rotating by setting it's MOI to float.PositiveInfinity. which is the better way to achieve this (performance wise)? either way, i think you should add a note like:
"NOTE: If you really want no rotation for a Body you should set it's MOI to float.PositiveInfinity."
"NOTE: It's also possible to fix the rotation of the Body by setting MOI to float.PositiveInfinity. however the AngleJoint approach has better performance."
...something like that