docs: thermal: sync hardware protection doc with code

Originally, the thermal framework's only hardware protection action was to
trigger a shutdown. This has been changed a little over a year ago to
also support rebooting as alternative hardware protection action.

Update the documentation to reflect this.

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 62e79e38b257 ("thermal/thermal_of: Allow rebooting after critical temp")
Signed-off-by: Ahmad Fatoum <[e-mail]>
Reviewed-by: Tzung-Bi Shih <[e-mail]>
Reviewed-by: Matti Vaittinen <[e-mail]>
Cc: Benson Leung <[e-mail]>
Cc: Daniel Lezcano <[e-mail]>
Cc: Fabio Estevam <[e-mail]>
Cc: Guenter Roeck <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: Liam Girdwood <[e-mail]>
Cc: Lukasz Luba <[e-mail]>
Cc: Mark Brown <[e-mail]>
Cc: Matteo Croce <[e-mail]>
Cc: "Rafael J. Wysocki" <[e-mail]>
Cc: Rob Herring (Arm) <[e-mail]>
Cc: Rui Zhang <[e-mail]>
Cc: Sascha Hauer <[e-mail]>
Cc: "Serge E. Hallyn" <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

Documentation/driver-api/thermal/sysfs-api.rst

···
 device. It sets the cooling device to the deepest cooling state if
 possible.
 
-5. thermal_emergency_poweroff
-=============================
+5. Critical Events
+==================
 
-On an event of critical trip temperature crossing the thermal framework
-shuts down the system by calling hw_protection_shutdown(). The
-hw_protection_shutdown() first attempts to perform an orderly shutdown
-but accepts a delay after which it proceeds doing a forced power-off
-or as last resort an emergency_restart.
+On an event of critical trip temperature crossing, the thermal framework
+will trigger a hardware protection power-off (shutdown) or reboot,
+depending on configuration.
+
+At first, the kernel will attempt an orderly power-off or reboot, but
+accepts a delay after which it proceeds to do a forced power-off or
+reboot, respectively. If this fails, ``emergency_restart()`` is invoked
+as last resort.
 
 The delay should be carefully profiled so as to give adequate time for
-orderly poweroff.
+orderly power-off or reboot.
 
-If the delay is set to 0 emergency poweroff will not be supported. So a
-carefully profiled non-zero positive value is a must for emergency
-poweroff to be triggered.
+If the delay is set to 0, the emergency action will not be supported. So a
+carefully profiled non-zero positive value is a must for the emergency
+action to be triggered.