Docs: Edit prometheus data source doc (#23760)

* Update prometheus.md

* Editing

* Update prometheus.md

* Update add-a-data-source.md

* Update prometheus.md

Co-authored-by: Daniel Lee <dan.limerick@gmail.com>

docs/sources/features/datasources/add-a-data-source.md

@@ -12,6 +12,8 @@ weight = 2
 
 Before you create your first dashboard, you need to add your data source. Following are the list of instructions to create one.
 
+> Only users with the Admin role can add data sources.
+
 1. Move your cursor to the cog on the side menu which will show you the configuration menu. If the side menu is not visible click the Grafana icon in the upper left corner. Click on **Configuration** > **Data Sources** in the side menu and you'll be taken to the data sources page
    where you can add and edit data sources. You can also click the cog.
 {{< docs-imagebox img="/img/docs/v52/sidemenu-datasource.png" max-width="250px" class="docs-image--no-shadow">}}
@@ -24,6 +26,6 @@ Before you create your first dashboard, you need to add your data source. Follow
 
     {{< docs-imagebox img="/img/docs/v52/datasource-settings.png" max-width="700px" class="docs-image--no-shadow">}}
 
-1. In the **Type**, select the type of data source. See [Supported data sources]({{< relref "../../features/datasources/#supported-data-sources/" >}}) for more information and how to configure your data source.
+1. In the **Type**, select the type of data source. See [Supported data sources]({{< relref "../../features/datasources/#supported-data-sources/" >}}) for more information and how to configure your data source settings.
 
 1. Click **Save & Test**.