[Openid-specs-ab] Issue #1598: Rename Issuance Initiation `issuer` parameter to `iss` (openid/connect)

[Thomas Bellebaum]

New issue 1598: Rename Issuance Initiation `issuer` parameter to `iss`
https://bitbucket.org/openid/connect/issues/1598/rename-issuance-initiation-issuer

Thomas Bellebaum:

Invocations of the Issuance Initiation Endpoint \(potentially via a redirect\) require a parameter called `issuer`, identifying the OP. There is a similar parameter for Authorization Responses defined in [RFC 9207](https://datatracker.ietf.org/doc/rfc9207/): `iss`

While the use case there is slightly different \(prevent mix-up attacks\), I think we should use one parameter name consistently to simplify the spec.