Fix Javadoc warnings in spring-security-web

* Use <code> tags for external references in DelegatingMissingAuthorityAccessDeniedHandler and SwitchUserWebFilter
* Fix typo in SessionAuthenticationException
* Apply javadoc-warnings-error plugin

Closes gh-18468

Signed-off-by: rigu1 <dlsrbtla@gmail.com>

Author: Rigu1

web/spring-security-web.gradle

@@ -1,5 +1,6 @@
 plugins {
 	id 'security-nullability'
+	id 'javadoc-warnings-error'
 }
 
 apply plugin: 'io.spring.convention.spring-module'

web/src/main/java/org/springframework/security/web/access/DelegatingMissingAuthorityAccessDeniedHandler.java

@@ -78,7 +78,7 @@
  * @since 7.0
  * @see AuthorizationDeniedException
  * @see AuthorityAuthorizationDecision
- * @see org.springframework.security.config.annotation.web.configurers.ExceptionHandlingConfigurer
+ * <code>org.springframework.security.config.annotation.web.configurers.ExceptionHandlingConfigurer</code>
  */
 public final class DelegatingMissingAuthorityAccessDeniedHandler implements AccessDeniedHandler {
 

web/src/main/java/org/springframework/security/web/authentication/session/SessionAuthenticationException.java

@@ -22,14 +22,13 @@
 
 /**
  * Thrown by an {@link SessionAuthenticationStrategy} or
- * {@link ServerSessionAuthenticationStrategy} to indicate that an authentication object
- * is not valid for the current session, typically because the same user has exceeded the
- * number of sessions they are allowed to have concurrently.
+ * {@link SessionAuthenticationStrategy} to indicate that an authentication object is not
+ * valid for the current session, typically because the same user has exceeded the number
+ * of sessions they are allowed to have concurrently.
  *
  * @author Luke Taylor
  * @since 3.0
  * @see SessionAuthenticationStrategy
- * @see ServerSessionAuthenticationStrategy
  */
 public class SessionAuthenticationException extends AuthenticationException {
 

web/src/main/java/org/springframework/security/web/server/authentication/SwitchUserWebFilter.java

@@ -80,7 +80,7 @@
  * To configure the Switch User Processing Filter, create a bean definition for the Switch
  * User processing filter and add to the filterChainProxy. Note that the filter must come
  * <b>after</b> the
- * {@link org.springframework.security.config.web.server.SecurityWebFiltersOrder#AUTHORIZATION}
+ * <code>org.springframework.security.config.web.server.SecurityWebFiltersOrder#AUTHORIZATION</code>
  * in the chain, in order to apply the correct constraints to the <tt>switchUserUrl</tt>.
  * Example: <pre>
  * SwitchUserWebFilter filter = new SwitchUserWebFilter(userDetailsService, loginSuccessHandler, failureHandler);