Link to style guide (Will-fix: #10225)

wiki/src/contribute/how/documentation.mdwn

@@ -41,6 +41,7 @@ before sharing them with us.
 # Guidelines and style
 
 - [[Documentation guidelines|guidelines]]
+- [[Documentation style guide|style_guide]]
 - [[Checklist for writing release notes|release_notes]]
 
 # Tools

wiki/src/contribute/how/documentation/style_guide.mdwn

+[[!meta title="Documentation style guide"]]
+
 - **bulleted lists**
 
   Refer to this article from NN/g on [presenting bulleted