Directly log gyro angular velocity.

Change-Id: Ia45bf8c0c54986919a33495eda48284bdacf48b1
diff --git a/frc971/wpilib/gyro_interface.h b/frc971/wpilib/gyro_interface.h
index baba248..05b9bff 100644
--- a/frc971/wpilib/gyro_interface.h
+++ b/frc971/wpilib/gyro_interface.h
@@ -27,7 +27,7 @@
   // Returns all of the error bits in the "footer" from value.
   uint8_t ExtractErrors(uint32_t value) { return (value >> 1) & 0x7F; }
 
-  // Returns the anglular rate contained in value.
+  // Returns the anglular rate contained in value in radians/sec.
   double ExtractAngle(uint32_t value);
 
   // Performs a transaction with the gyro.