iio: Documentation: sysfs-bus-iio-meas-spec: Remove (partially) duplicate line

Signed-off-by: NStefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Documentation/ABI/testing/sysfs-bus-iio-meas-spec

@@ -5,4 +5,3 @@ Description:
                 Reading returns either '1' or '0'. '1' means that the
                 battery level supplied to sensor is below 2.25V.
                 This ABI is available for tsys02d, htu21, ms8607
-		This ABI is available for htu21, ms8607