sensor: sort units and document all types

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9f227d4c670cb03a704855bb0cca9f3920b3e098
diff --git a/yaml/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml b/yaml/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
index fbb6d78..2f444b4 100644
--- a/yaml/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
+++ b/yaml/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
@@ -4,16 +4,16 @@
     implementing Sensor.Threshold.HardShutdown must be instantiated in the
     correct hierarchy within the sensors namespace.  The following sensor
     hierarchies are recognized:
-      temperature
-      fan_tach
-      voltage
+      airflow
       altitude
       current
-      power
       energy
-      utilization
-      airflow
+      fan_tach
+      power
       pressure
+      temperature
+      utilization
+      voltage
 
     Additionally, any object implementing Sensor.Threshold.HardShutdown must
     also implement Sensor.Value.