Docs: Update section on plugin dev for explore (#31905)

* Update section on preferredVisualisationType

* wording changes

* Update docs/sources/developers/plugins/add-support-for-explore-queries.md

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

* Update docs/sources/developers/plugins/add-support-for-explore-queries.md

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>

* Update docs/sources/developers/plugins/add-support-for-explore-queries.md

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>

docs/sources/developers/plugins/add-support-for-explore-queries.md

@@ -4,7 +4,7 @@ title = "Add support for Explore queries"
 
 # Add support for Explore queries
 
-This guide explains how to improve support for [Explore]({{< relref "../../explore/_index.md" >}}) to an existing data source plugin.
+This guide explains how to improve support for [Explore]({{< relref "../../explore/_index.md" >}}) in an existing data source plugin.
 
 This guide assumes that you're already familiar with how to [Build a data source plugin]({{< relref "/tutorials/build-a-data-source-plugin.md" >}}).
 
@@ -85,25 +85,20 @@ The query editor for Explore is similar to the query editor for the data source
    };
    ```
 
-## Support multiple Explore modes
+## Selecting preferred visualisation
 
-Explore lets you query any data source, regardless of whether it returns metrics or logs. You can change which type of query you want to make, by setting the _Explore mode_.
+Explore should by default select a reasonable visualization for your data so users do not have to tweak and play with the visualizations and just focus on querying. This usually works fairly well and Explore can figure out whether the returned data is time series data or logs or something else.
 
-The query modes that the plugin supports are defined in the [plugin.json]({{< relref "metadata.md" >}}) file.
-
-The query mode is available on the `props` object for both the query editor and the start page. For example, here's how you can change the query editor based on the currently selected mode:
+If this does not work for you or you want to show some data in a specific visualization, add a hint to your returned data frame using the `preferredVisualisationType` meta attribute.
 
+You can construct a data frame with specific metadata:
 ```
-export default (props: Props) => {
-  const { query, exploreMode } = props;
-
-  switch (exploreMode) {
-    case ExploreMode.Metrics:
-      return <MetricsQueryField query={query} />;
-    case ExploreMode.Logs:
-      return <LogsQueryField query={query} />;
-    default:
-      return <p>Unsupported mode</p>;
-  }
-}
+const firstResult = new MutableDataFrame({
+    fields: [...],
+    meta: {
+        preferredVisualisationType: 'logs',
+    },
+});
 ```
+
+For possible options, refer to [PreferredVisualisationType](https://grafana.com/docs/grafana/latest/packages_api/data/preferredvisualisationtype/).