Update PKEY2005.md

PKEY2005.md

@@ -184,9 +184,9 @@ The final value of M can then be interpreted with the following bitfields:
 
 ```c
 struct DECODED_PKEY {
-    uint auth : 10; // presumed to be authentication bits
-    uint pid : 30; // middle 9 digits of Product ID
     bool upgrade : 1; // presumed to indicate upgrade keys
+    uint pid : 30; // middle 9 digits of Product ID
+    uint auth : 10; // presumed to be authentication bits
 }
 ```