Fix typo in Turbine example url (#2568)

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

@@ -678,7 +678,7 @@ eureka:
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-The configuration key `turbine.appConfig` is a list of eureka serviceIds that turbine will use to lookup instances.  The turbine stream is then used in the Hystrix dashboard using a url that looks like: `http://my.turbine.sever:8080/turbine.stream?cluster=CLUSTERNAME` (the cluster parameter can be omitted if the name is "default"). The `cluster` parameter must match an entry in `turbine.aggregator.clusterConfig`. Values returned from eureka are uppercase, thus we expect this example to work if there is an app registered with Eureka called "customers":
+The configuration key `turbine.appConfig` is a list of eureka serviceIds that turbine will use to lookup instances.  The turbine stream is then used in the Hystrix dashboard using a url that looks like: `http://my.turbine.server:8080/turbine.stream?cluster=CLUSTERNAME` (the cluster parameter can be omitted if the name is "default"). The `cluster` parameter must match an entry in `turbine.aggregator.clusterConfig`. Values returned from eureka are uppercase, thus we expect this example to work if there is an app registered with Eureka called "customers":
 
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 turbine: