fixed mysql session example config

conf/defaults.ini

@@ -74,7 +74,7 @@ provider = file
 # file: session dir path, is relative to grafana data_path
 # redis: config like redis server e.g. `addr=127.0.0.1:6379,pool_size=100,db=grafana`
 # postgres: user=a password=b host=localhost port=5432 dbname=c sslmode=disable
-# mysql: go-sql-driver/mysql dsn config string, e.g. `user:password@tcp(127.0.0.1)/database_name`
+# mysql: go-sql-driver/mysql dsn config string, e.g. `user:password@tcp(127.0.0.1:3306)/database_name`
 
 provider_config = sessions
 

conf/sample.ini

@@ -73,7 +73,7 @@
 # memory: not have any config yet
 # file: session dir path, is relative to grafana data_path
 # redis: config like redis server e.g. `addr=127.0.0.1:6379,pool_size=100,db=grafana`
-# mysql: go-sql-driver/mysql dsn config string, e.g. `user:password@tcp(127.0.0.1)/database_name`
+# mysql: go-sql-driver/mysql dsn config string, e.g. `user:password@tcp(127.0.0.1:3306)/database_name`
 # postgres: user=a password=b host=localhost port=5432 dbname=c sslmode=disable
 ;provider_config = sessions