SpringBoot Delete WebSecurityConfigurerAdapter from Javadoc in SpringBootWebSecurityConfiguration / SecurityProperties

WebSecurityConfigurerAdapter was finally removed #10902 and thus the Javadoc of two classes in Spring Boot should be updated:

• https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/servlet/SpringBootWebSecurityConfiguration.java and remove WebSecurityConfigurerAdapter

• https://github.com/spring-projects/spring-boot/blob/main/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/SecurityProperties.java

The reference to WebSecurityConfigurerAdapter can be deleted.