Docs: added clarification to plugin provisioning (#50212)

* Docs: added clarification to plugin provisioning

* Update docs/sources/administration/provisioning.md

* Lint docs

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
Co-authored-by: Jack Baldry <jack.baldry@grafana.com>

docs/sources/administration/provisioning/_index.md

@@ -233,7 +233,10 @@ datasources:
 
 > This feature is available from v7.1
 
-You can manage plugins in Grafana by adding one or more YAML config files in the [`provisioning/plugins`]({{< relref "../../setup-grafana/configure-grafana/#provisioning" >}}) directory. Each config file can contain a list of `apps` that will be updated during start up. Grafana updates each app to match the configuration file.
+You can manage plugin applications in Grafana by adding one or more YAML config files in the [`provisioning/plugins`]({{< relref "../../setup-grafana/configure-grafana/#provisioning" >}}) directory. Each config file can contain a list of `apps` that will be updated during start up. Grafana updates each app to match the configuration file.
+
+> **Note:** This feature enables you to provision plugin configurations, not the plugins themselves.
+> The plugins must already be installed on the grafana instance
 
 ### Example plugin configuration file