Update README.md

Author: haata

hid-io-protocol/spec/README.md

@@ -623,6 +623,9 @@ Various test commands used during manufacturing to validate the hardware.
             Args:
             * 0x0000 - Disable
             * 0x0001 - Enable
+            * 0x0002 - Activate LED short test (see 0x51 for result)
+            * 0x0003 - Activate LED open circuit test (see 0x51 for result)
+            
  * 0x0002 - LED cycle on keypress test
             Used with shake tests to determine if there are hair-trigger switches.
             On each press or release event, cycle to a different LED event.
@@ -649,8 +652,12 @@ Various test commands used during manufacturing to validate the hardware.
  * 0x0001 - LED test sequence
             Generally cycles through all available colors to check for dead LEDs.
             Args:
-            * 0x0000 - Disable
-            * 0x0001 - Enable
+            * 0x0002 - Activate LED short test
+              Payload: List of channel ids that are shorted
+                       [<channel:16 bits>...]
+            * 0x0003 - Activate LED open circuit test
+              Payload: List of channel ids that are open circuit
+                       [<channel:16 bits>...]
  * 0x0002 - LED cycle on keypress test
             Used with shake tests to determine if there are hair-trigger switches.
             On each press or release event, cycle to a different LED event.