Updated goal and position messages for hood

Updated messages to reflect the change from linear to angular system.

Change-Id: I4761ef5c80c4e5f6256854d774553ae680a63839
diff --git a/y2020/control_loops/superstructure/superstructure_position.fbs b/y2020/control_loops/superstructure/superstructure_position.fbs
index ed73e52..21d7f7c 100644
--- a/y2020/control_loops/superstructure/superstructure_position.fbs
+++ b/y2020/control_loops/superstructure/superstructure_position.fbs
@@ -13,7 +13,7 @@
 }
 
 table Position {
-  // Zero is at the horizontal, positive towards the front (meters on the lead screw).
+  // Zero is at the horizontal, positive towards the front (radians).
   hood:frc971.AbsolutePosition;
 
   // Position of the intake. 0 when four-bar is vertical, positive extended.