fix(docs): update link to profiles sync setup doc

Author: JasonSooter

src/unify/index.md

@@ -83,7 +83,7 @@ Use Profiles Sync to connect identity-resolved customer profiles to a data wareh
 
 With a continual flow of synced profiles, teams can enrich and use these data sets as the basis for new audiences and models. Profiles Sync addresses a number of use cases, with applications for identity graph monitoring, attribution analysis, machine learning, and more.
 
-Visit the [Profiles Sync Setup](/unify/profiles-sync/profiles-sync-setup/) doc to learn more.
+Visit the [Profiles Sync Setup](/docs/unify/profiles-sync/profiles-sync-setup/) doc to learn more.
 
 ## Next steps: activate your profiles with Engage