Spring Security Update javadoc of HttpSecurity, WebSecurityConfiguration and WebSecurity to reflect deprecation of WebSecurityConfigurerAdapter

WebSecurityConfigurerAdapter has been deprecated in Spring Security 5.7 but the javadoc of the following classes still encourages its use: - HttpSecurity: https://github.com/spring-projects/spring-security/blob/4caf53e96dce93f9e196e8fc8c810acb14c32bed/config/src/main/java/org/springframework/security/config/annotation/web/builders/HttpSecurity.java#L117-L128 - WebSecurityConfiguration: https://github.com/spring-projects/spring-security/blob/4caf53e96dce93f9e196e8fc8c810acb14c32bed/config/src/main/java/org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.java#L57 - and WebSecurity: https://github.com/spring-projects/spring-security/blob/4caf53e96dce93f9e196e8fc8c810acb14c32bed/config/src/main/java/org/springframework/security/config/annotation/web/builders/WebSecurity.java#L80