dt-bindings: iio: cleanup examples - indentation

Use 4-space indentation (for cases when it is neither 4 not 2 space).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Alexandru Lazar <alazar@startmail.com> # max1241
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230124081037.31013-5-krzysztof.kozlowski@linaro.org


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>