iio: ABI: stm32-timer-trigger: Fuse unusual ABI into main doc.

We can't duplicate the description of sampling_frequency. This device
has some unusual requirements which we solved by giving a
sampling_frequency of 0 special meaning. As such add a note
about this unusual usage to the main documentation.

Whilst I don't particularly like this resolution, it is the best
I could come up with given earlier discussion on this topic.

Link: https://lore.kernel.org/linux-iio/[email protected]/
Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Fabrice Gasnier <[email protected]>
Reviewed-by: Mauro Carvalho Chehab <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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