Documentation/hwmon: Document hwmon_notify_event()

The hwmon core provides hwmon_notify_event() for drivers to report events
such as alarm or fault conditions to userspace via sysfs notifications
and uevents, as well as to the thermal subsystem for temperature sensors.
However, this function is not documented in the hwmon kernel API guide.

Add the function prototype and description of hwmon_notify_event() to
Documentation/hwmon/hwmon-kernel-api.rst.

Cc: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Fixes: 1597b374af222 ("hwmon: Add notification support")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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