title updates for docs

docs/sources/configuration/_index.md

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+# Configuration
+
 ## Enable plugin
 
 Go to the plugins in Grafana side panel, select _Apps_ tab, then select _Zabbix_, open _Config_

docs/sources/configuration/direct-db-datasource.md

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+# Direct DB Data Source Configuration
+
 ## Security notes
 
 Grafana-Zabbix plugin can use MySQL, Postgres or InfluxDB (if Zabbix configured to store history data in InfluxDB) data sources to query history and trend data directly from Zabbix database. In order to execute queries, plugin needs only read access to the `history`, `history_uint`, `trends` and `trends_uint` tables. To make connection more secure and prevent unnecessary data disclosure, it's highly recommended to grant read access to only that tables. But if you want to use this data source for querying another data, you can

docs/sources/configuration/provisioning.md

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+# Provisioning Grafana-Zabbix plugin
+
 It’s now possible to configure datasources using config files with Grafana’s provisioning system. You can read more about how it works and all the settings you can set for datasources on the [provisioning docs page](http://docs.grafana.org/administration/provisioning/#datasources)
 
-### Example Datasource Config File
+## Example Datasource Config File
 
 ```yaml
 apiVersion: 1

docs/sources/configuration/troubleshooting.md

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+# Troubleshooting
+
 See [Grafana troubleshooting](http://docs.grafana.org/installation/troubleshooting/) for general
 connection issues. If you have a problem with Zabbix datasource, you should open
 a [support issue](https://github.com/alexanderzobnin/grafana-zabbix/issues). Before you do that