Add note that cross-device flow diagram doesn't show all parameters

As per Oliver's suggestion on the issue

closes #600

Author: jogu

openid-4-verifiable-presentations-1_0.md

@@ -189,7 +189,7 @@ Figure: Same Device Flow
 
 In this flow, the Verifier prepares an Authorization Request and renders it as a QR Code. The End-User then uses the Wallet to scan the QR Code. The Presentations are sent to the Verifier in a direct HTTP POST request to a URL controlled by the Verifier. The flow uses the Response Type `vp_token` in conjunction with the Response Mode `direct_post`, both defined in this specification. In order to keep the size of the QR Code small and be able to sign and optionally encrypt the Request Object, the actual Authorization Request contains just a Request URI according to [@!RFC9101], which the wallet uses to retrieve the actual Authorization Request data.
 
-Note: The diagram does not illustrate all the optional features of this specification.
+Note: The diagram does not illustrate all parameters and optional features of this specification.
 
 Note: The usage of the Request URI as defined in [@!RFC9101] does not depend on any other choices made in the protocol extensibility points, i.e., it can be used in the Same Device Flow, too.