minor: fixing table of contents link

Author: Sam Kleinman

source/includes/toc-spec-security-tutorials-landing.yaml

@@ -21,7 +21,7 @@ files:
     level: 2
   - file: /tutorial/define-roles
     level: 2
-  - file: /tutorial/change-user-privilege
+  - file: /tutorial/change-user-privileges
     level: 2
   - file: /tutorial/view-roles
     level: 2