Update paris.md (#568)

Update paris

Author: Olexandr88

src/engine/paris.md

@@ -235,7 +235,7 @@ The payload build process is specified as follows:
   * `{error: {code: -38002, message: "Invalid forkchoice state"}}` if `forkchoiceState` is either invalid or inconsistent
   * `{error: {code: -38003, message: "Invalid payload attributes"}}` if the payload is deemed `VALID` and `forkchoiceState` has been applied successfully, but no build process has been started due to invalid `payloadAttributes`.
 
-10. If any of the above fails due to errors unrelated to the normal processing flow of the method, client software **MUST** respond with an error object.
+9. If any of the above fails due to errors unrelated to the normal processing flow of the method, client software **MUST** respond with an error object.
 
 ### engine_getPayloadV1