set example port to zipkin default

conf/defaults.ini

@@ -454,7 +454,7 @@ url = https://grafana.com
 
 #################################### Distributed tracing ############
 [tracing.jaeger]
-# jaeger destination (ex localhost:5775)
+# jaeger destination (ex localhost:6831)
 address =
 
 #################################### External Image Storage ##############

conf/sample.ini

@@ -393,8 +393,8 @@
 
 #################################### Distributed tracing ############
 [tracing.jaeger]
-# Enable by setting the address sending traces to jaeger (ex localhost:5775)
-;address = localhost:5775
+# Enable by setting the address sending traces to jaeger (ex localhost:6831)
+;address = localhost:6831
 
 #################################### Grafana.com integration  ##########################
 # Url used to to import dashboards directly from Grafana.com