qtm: clarify documentation some more

Author: TuxSH

libctru/include/3ds/services/qtm.h

@@ -15,7 +15,7 @@
  *        done via a TI TCA6416A I2C->Parallel expander (highlighted in yellow in this teardown photo:
  *        https://guide-images.cdn.ifixit.com/igi/IKlW6WTZKKmapYkt.full, with the expected 12 traces
  *        being clearly visible near the ribbon cable slot); the parallax barrier polarity and pattern
- *        is dithered by software approximately every frame.
+ *        is dithered by software approximately every 10ms (corresponding to one gyro sample).
  *      - updating the barrier position according to head tracking data relative to an optimal setting
  *        stored in calibration data: this is what Nintendo calls "Super Stable 3D" (SS3D); not done
  *        when in 2D mode

libctru/include/3ds/services/qtmc.h

@@ -52,8 +52,8 @@ Result QTMC_StopHardwareCheck(void);
  *         QTM's expander management thread repeatedly writes (on every loop iteration) the current mask pattern
  *         plus polarity bit, whether it is normally set or overridden by `qtm:c`, then on the following set,
  *         negates both (it writes pattern ^ 0x1FFF). This is done at all times, even it 2D mode. This software-
- *         controlled dithering seems to at every sampling interval, about 60 times per second (I couldn't
- *         formally verify this timing).
+ *         controlled dithering seems to at every sampling interval, about 100 times per second (when it receives
+ *         a new gyro sample).
  *
  *         The register being written to are regId 0x02 and 0x03 (output ports).
  *         TI TCA6416A I2C->Parallel expander is located on bus I2C1 (PA 0x10161000) device ID 0x40.