Fix design artifact should not be removed

CONTRIBUTING.md

@@ -320,9 +320,9 @@ and use a title that makes it clear that the scheduled issue is design only
 (e.g. `Design exploration for XYZ`).
 When the ~"design artifact" issue has been completed, the UXer removes the ~UX
-and ~"design artifact" labels, adds the ~"UX ready" label and closes the issue.
-This indicates the design artifact is complete. The UXer will also copy the
-designs to related issues for implementation in an upcoming milestone.
+labels, adds the ~"UX ready" label and closes the issue. This indicates the
+design artifact is complete. The UXer will also copy the designs to related
+issues for implementation in an upcoming milestone.
 ## Issue tracker