Add description for <LogoutTokenExpiration> configuration
<SkipUserConsent>false</SkipUserConsent>
<!-- Sign the ID Token with Service Provider Tenant Private Key-->
<SignJWTWithSPKey>false</SignJWTWithSPKey>
+ <!--
+ Expiry period of the logout token used in OIDC Back Channel Logout in seconds.
+ Supported versions: IS 5.5.0 onwards
+ -->
<LogoutTokenExpiration>120</LogoutTokenExpiration>
</OpenIDConnect>
