Polish Web Authentication Builders

Issue gh-17861

web/src/main/java/org/springframework/security/web/authentication/preauth/PreAuthenticatedAuthenticationToken.java

@@ -21,7 +21,6 @@ import java.util.Collection;
 import org.jspecify.annotations.Nullable;
 
 import org.springframework.security.authentication.AbstractAuthenticationToken;
-import org.springframework.security.core.Authentication;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.util.Assert;
 
@@ -96,7 +95,7 @@ public class PreAuthenticatedAuthenticationToken extends AbstractAuthenticationT
 	}
 
 	/**
-	 * A builder preserving the concrete {@link Authentication} type
+	 * A builder of {@link PreAuthenticatedAuthenticationToken} instances
 	 *
 	 * @since 7.0
 	 */