fix config.js

docs/.vuepress/config.js

@@ -374,7 +374,7 @@ module.exports = {
                             { text: 'Spring Statemachine', link: '/spring-statemachine/spring-statemachine.html' },
                             { text: 'Spring Vault', link: '/spring-vault/spring-vault.html' },
                             { text: 'Spring Web Flow', link: '/spring-web-flow/preface.html' },
-                            { text: 'Spring Web Services', link: '/spring-web-services/spring-web-services.html' }
+                            { text: 'Spring Web Services', link: '/spring-web-services/spring-web-service.html' }
                         ]
                     }
                 ],