Addressing one more of Mike's previous review comments (#466)

* Addressing one more or Mike's previous review comments

* Update upload artifact to v4 to avoid being "automatically failed because it uses a deprecated version"

Author: bc-pi

draft-ietf-oauth-selective-disclosure-jwt.md

@@ -733,7 +733,9 @@ The following payload is used for the SD-JWT:
 
 <{{examples/simple/sd_jwt_payload.json}}
 
-The respective Disclosures are created by the Issuer:
+The respective Disclosures, created by the Issuer, are listed below.
+In the text below and in other locations in this specification,
+the label "SHA-256 Hash:" is used as a shorthand for the label "Base64url-Encoded SHA-256 Hash:".
 
 {{examples/simple/disclosures.md}}