Document the new padding option.

Author: pbarry-r7

documentation/modules/post/hardware/automotive/getvinfo.md

@@ -24,7 +24,11 @@ PIDs to ASCII.
 
   **CLEAR_DTCS***
 
-  If any Diagnostic Trouble Codes (DTCs) are present it will clear those and reset the MIL (Enginge Light)
+  If any Diagnostic Trouble Codes (DTCs) are present it will clear those and reset the MIL (Engine Light).
+
+  **PADDING**
+
+  Optional byte-value to use for padding all CAN bus packets to an 8-byte length.  Padding is disabled by default.
 
 ## Scenarios