thermal: core: thermal_core.h: fix all kernel-doc warnings

thermal: core: thermal_core.h: fix all kernel-doc warnings

Resolve all kernel-doc warnings in thermal_core.h:

Warning: drivers/thermal/thermal_core.h:99 bad line: trip point.
Warning: drivers/thermal/thermal_core.h:101 bad line: passive trip point.
Warning: drivers/thermal/thermal_core.h:152 struct member 'trips_attribute_group' not described in 'thermal_zone_device'
Warning: drivers/thermal/thermal_core.h:152 struct member 'debugfs' not described in 'thermal_zone_device'
Warning: drivers/thermal/thermal_core.h:152 struct member 'user_thresholds' not described in 'thermal_zone_device'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20260128062446.402175-1-rdunlap@infradead.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>