Fix documentation in fridge.q and actions.

Austin made zero on the arm sticking straight up, and the comments
in fridge.q ended up being wrong. I fixed these comments, as well
as the actions that I had written based on them.

I also made the comments in fridge.q about zero on the elevator
match the ones in constants.cc.

Change-Id: Ie50c99f6cafc82f0e4baba851cd20353a9d871ac
diff --git a/frc971/actors/score_actor.cc b/frc971/actors/score_actor.cc
index 25edbff..0ab54de 100644
--- a/frc971/actors/score_actor.cc
+++ b/frc971/actors/score_actor.cc
@@ -52,13 +52,13 @@
 
   // We're going to move the elevator first so we don't crash the fridge into
   // the ground.
-  DoProfile(values.fridge.arm_zeroing_height, M_PI / 2.0, true);
+  DoProfile(values.fridge.arm_zeroing_height, 0.0, true);
   // Now move them both together.
-  DoProfile(params.height, M_PI, true);
+  DoProfile(params.height, M_PI / 2.0, true);
   // Release the totes.
-  DoProfile(values.fridge.arm_zeroing_height, M_PI / 2.0, false);
+  DoProfile(values.fridge.arm_zeroing_height, 0.0, false);
   // Retract. Move back to our lowered position.
-  DoProfile(values.fridge.elevator.lower_limit, M_PI / 2.0, false);
+  DoProfile(values.fridge.elevator.lower_limit, 0.0, false);
 
   return true;
 }
diff --git a/frc971/actors/stack_actor.cc b/frc971/actors/stack_actor.cc
index ff9c739..6ce8fbd 100644
--- a/frc971/actors/stack_actor.cc
+++ b/frc971/actors/stack_actor.cc
@@ -28,7 +28,7 @@
   params.elevator_max_velocity = kElevatorMaxVelocity;
   params.elevator_max_acceleration = kElevatorMaxAccel;
 
-  params.arm_angle = M_PI / 2.0;
+  params.arm_angle = 0.0;
   params.arm_max_velocity = kArmMaxVelocity;
   params.arm_max_acceleration = kArmMaxAccel;