Whats'new : Added new datasource permission api changes (#78571)

* Update index.md

added datasource permission api changes that have been introduced from version 9.2

For info - https://raintank-corp.slack.com/archives/C5PG2JK8W/p1700641440476549

* Update docs/sources/upgrade-guide/upgrade-v10.2/index.md

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

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Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

docs/sources/upgrade-guide/upgrade-v10.2/index.md

@@ -19,3 +19,5 @@ weight: 1500
 {{< docs/shared lookup="upgrade/upgrade-common-tasks.md" source="grafana" version="<GRAFANA VERSION>" >}}
 
 ## Technical notes
+
+- From Grafana v10.2 onwards, `/api/datasources/:id/` is removed and replaced with `/api/access-control/datasources/:uid`. For more information about the new API endpoints for the data source permission API, refer to the [documentation](https://grafana.com/docs/grafana/<GRAFANA_VERSION>/developers/http_api/datasource_permissions/).