[indexes] Explicitly indicate that Indexes should use the generation date, not the source file's last-modified date.

tabatkins · tabatkins · commit e031ff5d30e7 · 2018-09-10T12:50:41.000-07:00
diff --git a/indexes/Overview.bs b/indexes/Overview.bs
@@ -4,6 +4,7 @@ Shortname: indexes
 Level: 1
 Group: CSSWG
 Status: NOTE
+Date: now
 Work Status: exploring
 Editor: Tab Atkins-Bittner, w3cid 42199
 ED: https://drafts.csswg.org/indexes/
