Designs page: Fix link attributes support

Bug: Issue 12295
Change-Id: Id39915ff196f85e6bec45c7165d156f18c9859a2
diff --git a/Documentation/dev-design-docs.txt b/Documentation/dev-design-docs.txt
index f8789f7..888b7dc 100644
--- a/Documentation/dev-design-docs.txt
+++ b/Documentation/dev-design-docs.txt
@@ -1,3 +1,4 @@
+:linkattrs:
 = Gerrit Code Review - Design Docs
 
 For the link:dev-contributing.html#design-driven-contribution-process[