Discovery - 3.2 scopes_supported should reference Messages

[Edmund Jay]

The current definition is : {{{ A JSON array containing a list of the OAuth 2.0 [OAuth2.0] scopes that this server supports. The server MUST support the openid scope. }}}

OAuth 2.0 does not define any scope values, so it should reference Messages 2.1.2 as follows :

{{{ A JSON array containing a list of the scopes defined in section 2.1.2 of OpenID Connect Messages 1.0 [OpenID.Messages] that this server supports. The server MUST support the openid scope. }}}