Update IETF-RFC.md

Co-authored-by: Giuseppe Lo Presti <[email protected]>

Author: mickenordin

IETF-RFC.md

@@ -657,7 +657,7 @@ contain the following information about its OCM API:
   for a short-lived bearer token.
   _ `"invite-wayf"` - to indicate that this OCM Server exposes a WAYF
   Page to facilitate the Invite flow.
-  _ `"rfc-http-sig"` - to indicate that this OCM Server supports
+  _ `"http-sig"` - to indicate that this OCM Server supports
   [RFC9421] HTTP Message Signatures and advertises public keys in the
   `publicKeys` array for signature verification.
 * OPTIONAL: criteria (array of string) - The criteria for accepting a