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iio:ABI docs: Combine sysfs-bus-iio-humidity-hdc2010/hdc100x into one file

These contain only one entry for out_current_heater_raw (_available).
Document this in a new sysfs-bus-iio-humidity file, and make it a little
more generic by allowing for non 0/1 values.

Fixes
$ scripts/get_abi.pl validate
Warning: /sys/bus/iio/devices/iio:deviceX/out_current_heater_raw is defined 2 times: ./Documentation/ABI/testing/sysfs-bus-iio-humidity-hdc2010:0 ./Documentation/ABI/testing/sysfs-bus-iio-humidity-hdc100x:0
Warning: /sys/bus/iio/devices/iio:deviceX/out_current_heater_raw_available is defined 2 times: ./Documentation/ABI/testing/sysfs-bus-iio-humidity-hdc2010:1 ./Documentation/ABI/testing/sysfs-bus-iio-humidity-hdc100x:1

Cc: Eugene Zaikonnikov <ez@norphonic.com>
Cc: Matt Ranostay <matt.ranostay@konsulko.com>
Reported-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com>
Link: https://lore.kernel.org/r/20210117153816.696693-6-jic23@kernel.org

Jonathan Cameron 4abbaf29 b923561f

+2 -10
-9
Documentation/ABI/testing/sysfs-bus-iio-humidity-hdc100x
··· 1 - What: /sys/bus/iio/devices/iio:deviceX/out_current_heater_raw 2 - What: /sys/bus/iio/devices/iio:deviceX/out_current_heater_raw_available 3 - KernelVersion: 4.3 4 - Contact: linux-iio@vger.kernel.org 5 - Description: 6 - Controls the heater device within the humidity sensor to get 7 - rid of excess condensation. 8 - 9 - Valid control values are 0 = OFF, and 1 = ON.
+2 -1
Documentation/ABI/testing/sysfs-bus-iio-humidity-hdc2010 Documentation/ABI/testing/sysfs-bus-iio-humidity
··· 6 6 Controls the heater device within the humidity sensor to get 7 7 rid of excess condensation. 8 8 9 - Valid control values are 0 = OFF, and 1 = ON. 9 + In some devices, this is just a switch in which case 0 = OFF, 10 + and 1 = ON.