fix: document describe error

[ShiningRush]

Fixed document describe error.

The OAuth 2.0 Client making the request is not allowed to request the scope openid

Should be refresh_token, according here

func canIssueRefreshToken(c *AuthorizeExplicitGrantHandler, request fosite.Requester) bool {
	// Require one of the refresh token scopes, if set.GetGrantTypes
	if len(c.RefreshTokenScopes) > 0 && !request.GetGrantedScopes().HasOneOf(c.RefreshTokenScopes...) {
		return false
	}
	// Do not issue a refresh token to clients that cannot use the refresh token grant type.
	if !request.GetClient().GetGrantTypes().Has("refresh_token") {
		return false
	}
	return true
}

[CLAassistant]

All committers have signed the CLA.

[aeneasr]

Awesome 🎉

Thank you for your contribution!