Update index.bs

Author: tttzach

spec/index.bs

@@ -804,7 +804,6 @@ the exception thrown.
                 * If the user cancels this dialog, return (failure, true).
                 * If the user triggers this affordance, [=fetch the config file and show an IDP login dialog=]
                    with |provider| and |globalObject|.
-        |provider| and |globalObject|.
     1. Let |requiresUserMediation| be |provider|'s {{IdentityProviderConfig/configURL}}'s [=/origin=]'s
         [=requires user mediation=].
     1. Let |mediation| be |options|'s {{CredentialRequestOptions/mediation}}.