Minor format changes

Just fixed some minor inconsistencies in the format of the file. There were some configurations uncommented like so: 

```
; container_name =
```

and some other like so:

```
;container_name =
```

So there is a need for a small perfection here! 

I also removed some unnecessary line breaks, bullying my eyes... 

![<3](https://media.giphy.com/media/dTJd5ygpxkzWo/giphy.gif)

conf/sample.ini

@@ -4,10 +4,10 @@
 # change
 
 # possible values : production, development
-; app_mode = production
+;app_mode = production
 
 # instance name, defaults to HOSTNAME environment variable value or hostname if HOSTNAME var is empty
-; instance_name = ${HOSTNAME}
+;instance_name = ${HOSTNAME}
 
 #################################### Paths ####################################
 [paths]
@@ -21,7 +21,7 @@
 ;plugins = /var/lib/grafana/plugins
 
 # folder that contains provisioning config files that grafana will apply on startup and while running.
-; provisioning = conf/provisioning
+;provisioning = conf/provisioning
 
 #################################### Server ####################################
 [server]
@@ -121,7 +121,6 @@ log_queries =
 # This enables data proxy logging, default is false
 ;logging = false
 
-
 #################################### Analytics ####################################
 [analytics]
 # Server reporting, sends usage counters to stats.grafana.org every 24 hours.
@@ -323,7 +322,6 @@ log_queries =
 # optional settings to set different levels for specific loggers. Ex filters = sqlstore:debug
 ;filters =
 
-
 # For "console" mode only
 [log.console]
 ;level =
@@ -369,7 +367,6 @@ log_queries =
 # Syslog tag. By default, the process' argv[0] is used.
 ;tag =
 
-
 #################################### Alerting ############################
 [alerting]
 # Disable alerting engine & UI features