Outdated documentation for Kerberos integration

[sergeykad]

Describe the bug The documentation suggests using the deprecated WebSecurityConfigurerAdapter class for Kerberos integration.

To Reproduce See the following links: https://docs.spring.io/spring-security-kerberos/docs/current/reference/html/ssk-spnego.html https://docs.spring.io/spring-security-kerberos/docs/current/reference/htmlsingle/

Expected behavior There will be Kerberos integration examples aligned with the changes described here: https://spring.io/blog/2022/02/21/spring-security-without-the-websecurityconfigureradapter As it is, there is no documentation about how Kerberos integration should work now.