Docs: Add multi-window support doc to display section for the N release
      Minor cleanup on Do-not-distrub to fix broken page title

Bug: 27621451
Change-Id: I79b374e1e4ebbab7f7e3af2d560ce37acff78796
diff --git a/src/devices/tech/display/dnd.jd b/src/devices/tech/display/dnd.jd
index 9bf6b53..2e1a80b 100644
--- a/src/devices/tech/display/dnd.jd
+++ b/src/devices/tech/display/dnd.jd
@@ -1,4 +1,4 @@
-lpage.title=Configuring DND
+page.title=Configuring DND
 @jd:body
 
 <!--