Added route config

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

@@ -1618,7 +1618,7 @@ as a fallback.  Here is a very simple `ZuulFallbackProvider` implementation.
 class MyFallbackProvider implements ZuulFallbackProvider {
     @Override
     public String getRoute() {
-        return "zuulserver";
+        return "customers";
     }
 
     @Override
@@ -1660,6 +1660,15 @@ class MyFallbackProvider implements ZuulFallbackProvider {
 }
 ----
 
+And here is what the route configuration would look like.
+
+[source,yaml]
+----
+zuul:
+  routes:
+    customers: /customers/**
+----
+
 === Polyglot support with Sidecar
 
 Do you have non-jvm languages you want to take advantage of Eureka, Ribbon and