Docs: Update documentation-style-guide.md (#23659)

Added Divio link

contribute/style-guides/documentation-style-guide.md

@@ -4,6 +4,8 @@ This style guide applies to all documentation created for Grafana products.
 
 
 For information about how to write technical documentation, we suggest reviewing the content of the [Google Technical Writing courses](https://developers.google.com/tech-writing).
 For information about how to write technical documentation, we suggest reviewing the content of the [Google Technical Writing courses](https://developers.google.com/tech-writing).
 
 
+The [Divio documentation system](https://documentation.divio.com/) site is also a good resource.
+
 ## Contributing
 ## Contributing
 
 
 The *Documentation style guide* is a living document. Add to it whenever a style decision is made or a question is answered regarding style, grammar, or word choice.
 The *Documentation style guide* is a living document. Add to it whenever a style decision is made or a question is answered regarding style, grammar, or word choice.