Docs: Fix link to developing plugins (#75816)

* Docs: Fix link to developing plugins (#75788)

* Update docs/sources/administration/data-source-management/index.md

* Update docs/sources/administration/data-source-management/index.md

* Apply suggestions from code review

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Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

docs/sources/developers/_index.md

@@ -14,7 +14,7 @@ weight: 190
 Go to the [Grafana developer portal](/developers) to access the following documentation:
 
 - [Grafana plugin development](/developers/plugin-tools)
-- [Grafana UI component library](https://developers.grafana.com)
+- [Grafana design system](https://developers.grafana.com)
 - [Grafana Scenes](/developers/scenes)
 - [Grafana data plane](/developers/dataplane)