Add missing index entry for web_link.rst

dunglas · javiereguiluz · commit 3162df8bb83a · 2019-02-28T12:00:04.000+01:00
diff --git a/web_link.rst b/web_link.rst
@@ -1,3 +1,6 @@
+.. index::
+   single: Web Link
+
 Asset Preloading and Resource Hints with HTTP/2 and WebLink
 ===========================================================
 
