Fix eureka instance metadata in Cloud Foundry example

docs/src/main/asciidoc/spring-cloud-netflix.adoc

@@ -107,9 +107,9 @@ Cloudfoundry has a global router so that all instances of the same app have the
 ----
 eureka:
   instance:
-    metadataMap:
     hostname: ${vcap.application.uris[0]}
     nonSecurePort: 80
+    metadataMap:
       instanceId: ${vcap.application.instance_id:${spring.application.name}:${spring.application.instance_id:${server.port}}}
 ----