Update link to brand voice

doc/development/documentation/styleguide/index.md

@@ -16,7 +16,7 @@ use the `#docs-processes` channel.
 ## The GitLab voice
 
 The GitLab brand guidelines define the
-[voice used by the larger organization](https://design.gitlab.com/brand/overview/#tone-of-voice).
+[voice used by the larger organization](https://design.gitlab.com/brand-overview/brand-voice).
 
 Building on that guidance, the voice in the GitLab documentation strives to be concise,
 direct, and precise. The goal is to provide information that's easy to search and scan.