fix broken links (istio#123)

Former-commit-id: 681d2d5

README.md

@@ -57,7 +57,7 @@ project.
 contains platform-specific code to populate the
 [abstract service model](https://istio.io/docs/concepts/model.html), dynamically reconfigure the proxies
 when the application topology changes, as well as translate
-[routing rules](https://istio.io/docs/concepts/rule-dsl.html) into proxy specific configuration.  The
+[routing rules](https://istio.io/docs/reference/rule-dsl.html) into proxy specific configuration.  The
 [_istioctl_](https://istio.io/docs/reference/istioctl.html) command line utility is also available in
 this repository.
 

demos/apps/bookinfo/README.md

@@ -1,2 +1,2 @@
-See the [Bookinfo demo](https://istio.io/docs/demos/bookinfo.html) in Istio
+See the [Bookinfo demo](https://istio.io/docs/samples/bookinfo.html) in Istio
 docs for instructions on how to run this demo application.