Clarify that MeshConfig.localityLbSetting is enabled by default (#2737)

* Clarify that MeshConfig.localityLbSetting is enabled by default

Signed-off-by: Faseela K <[email protected]>

* address review comments

Signed-off-by: Faseela K <[email protected]>

---------

Signed-off-by: Faseela K <[email protected]>

Author: kfaseela

mesh/v1alpha1/config.pb.go

@@ -302,6 +302,9 @@ message MeshConfig {
   string root_namespace = 34;
 
   // Locality based load balancing distribution or failover settings.
+  // If unspecified, locality based load balancing will be enabled by default.
+  // However, this requires outlierDetection to actually take effect for a particular
+  // service, see https://istio.io/latest/docs/tasks/traffic-management/locality-load-balancing/failover/
   istio.networking.v1alpha3.LocalityLoadBalancerSetting locality_lb_setting = 35;
 
   // Configures DNS refresh rate for Envoy clusters of type `STRICT_DNS`