Fix missing dot in Vaadin URL Mapping example (#4709)

Author: HerbertsVaadin

articles/flow/integrations/spring/configuration.adoc

@@ -206,8 +206,7 @@ FilterRegistrationBean<?> publicImagesAliasFilter(@Value("${vaadin.url-mapping}"
                         throws ServletException, IOException {
         // Remove Vaadin URL mapping from the path and forward the request
         String path = request.getRequestURI().substring(baseMapping.length());
-        request.getRequestDispatcher(path)
-          forward(request, response);
+        request.getRequestDispatcher(path).forward(request, response);
       }
     });
   registrationBean.addUrlPatterns(baseMapping + "/images/*");