iio: Documentation: Fix calibheight unit

Change calibheight unit from centimeters to meters
to follow iio guidelines of using SI units.
Signed-off-by: NIrina Tirdea <irina.tirdea@intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Documentation/ABI/testing/sysfs-bus-iio

@@ -347,7 +347,7 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_steps_calibheight
 KernelVersion:	3.19
 Contact:	linux-iio@vger.kernel.org
 Description:
-		Height of the user (in centimeters) used by some pedometers
+		Height of the user (in meters) used by some pedometers
 		to compute the stride length, distance, speed and activity
 		type.