Correct the references to WebSecurityConfigurerAdapter in the docs

Closes gh-1861

Author: wilkinsona

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -1176,8 +1176,8 @@ the classes imported from there (`SpringBootWebSecurityConfiguration` for web se
 and `AuthenticationManagerConfiguration` for authentication configuration which is also
 relevant in non-web applications). To switch off the Boot default configuration
 completely in a web application you can add a bean with `@EnableWebSecurity`. To customize
-it you normally use external properties and beans of type `WebConfigurerAdapter` (e.g. to
-add form-based login). There are several secure applications in the
+it you normally use external properties and beans of type `WebSecurityConfigurerAdapter`
+(e.g. to add form-based login). There are several secure applications in the
 {github-code}/spring-boot-samples/[Spring Boot samples] to get you started with common
 use cases.
 
@@ -1195,7 +1195,7 @@ The basic features you get out of the box in a web application are:
 
 All of the above can be switched on and off or modified using external properties
 (`+security.*+`). To override the access rules without changing any other autoconfigured
-features add a `@Bean` of type `WebConfigurerAdapter` with
+features add a `@Bean` of type `WebSecurityConfigurerAdapter` with
 `@Order(SecurityProperties.ACCESS_OVERRIDE_ORDER)`.
 
 If the Actuator is also in use, you will find:
@@ -1206,7 +1206,7 @@ If the Actuator is also in use, you will find:
 
 The Actuator security features can be modified using external properties
 (`+management.security.*+`). To override the application access rules
-add a `@Bean` of type `WebConfigurerAdapter` and use
+add a `@Bean` of type `WebSecurityConfigurerAdapter` and use
 `@Order(SecurityProperties.ACCESS_OVERRIDE_ORDER)` if you _don't_ want to override
 the actuator access rules, or `@Order(ManagementServerProperties.ACCESS_OVERRIDE_ORDER)`
 if you _do_ want to override the actuator access rules.