[Openid-specs-risc] [openid/sharedsignals] 7b00ef: Add opaque to the required subject formats (#137)

[FragLegs]

  Branch: refs/heads/main
  Home:   https://github.com/openid/sharedsignals
  Commit: 7b00ef953c28ebd958f886e23cdde7716775d578
      https://github.com/openid/sharedsignals/commit/7b00ef953c28ebd958f886e23cdde7716775d578
  Author: Shayne Miel (he/him) <miel.shayne at gmail.com>
  Date:   2024-01-15 (Mon, 15 Jan 2024)

  Changed paths:
    M openid-caep-interoperability-profile-1_0.md

  Log Message:
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  Add opaque to the required subject formats (#137)

* Verification events MUST include an opaque sub_id. Since Transmitters MUST send verification events, then Receivers MUST be prepared to accept them.

* Add discloure about opaque being for the Verification event only