Update text around jwks to try to address Oliver's concern

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

@@ -263,7 +263,7 @@ This specification defines the following new request parameters:
 `client_metadata`:
 : OPTIONAL. A JSON object containing the Verifier metadata values. It MUST be UTF-8 encoded. The following metadata parameters MAY be used:
 
-    * `jwks`: OPTIONAL. A JWKS as defined in [@!RFC7591]. It MAY contain one or more public keys, such as keys used by the Wallet as an input to a key agreement that may be used for encryption of the Authorization Response (see (#jarm)), or keys for signature algorithms that require a public key of the Verifier. This allows the Verifier to pass ephemeral keys specific to this Authorization Request. Public keys included in this parameter MUST NOT be used to verify the signature of signed Authorization Requests.
+    * `jwks`: OPTIONAL. A JWKS as defined in [@!RFC7591]. It MAY contain one or more public keys, such as those used by the Wallet as an input to a key agreement that may be used for encryption of the Authorization Response (see (#jarm)), or where the Wallet will require the public key of the Verifier to generate the Verifiable Presentation. This allows the Verifier to pass ephemeral keys specific to this Authorization Request. Public keys included in this parameter MUST NOT be used to verify the signature of signed Authorization Requests.
     * `vp_formats`: REQUIRED when not available to the Wallet via another mechanism. As defined in (#client_metadata_parameters).
     * `authorization_signed_response_alg`: OPTIONAL. As defined in [@!JARM].
     * `authorization_encrypted_response_alg`: OPTIONAL. As defined in [@!JARM].