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Update accelerometer.md (#25532)

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docs/en/sensor/accelerometer.md
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@@ -5,7 +5,7 @@ PX4 uses accelerometer data for velocity estimation.
You should not need to attach an accelometer as a stand-alone external device:
- Most flight controllers, such as those in the [Pixhawk Series](../flight_controller/pixhawk_series.md), include an accelerometer as part of the flight controller's [Inertial Motion Unit (IMU)](https://en.wikipedia.org/wiki/Inertial_measurement_unit).
- Gyroscopes are present as part of an [external INS, ARHS or INS-enhanced GNSS system](../sensor/inertial_navigation_systems.md).
- Gyroscopes are present as part of an [external INS, AHRS or INS-enhanced GNSS system](../sensor/inertial_navigation_systems.md).
The accelerometer must be calibrated before first use of the vehicle: