docs: PIP-related fix to N preview API overview doc

In api-overview, we removed the short section describing PIP
(because it's already mentioned in the multi-window section).
However, we still refer to it in the multi-window section by
saying "See below for more information". This CL just removes
that statement.

Staged preview URL in comment in CL

Bug: 27569802
Change-Id: Iab6f5da3af7b13eb9dc93e5f8fa786129760a5a1
diff --git a/docs/html/preview/api-overview.jd b/docs/html/preview/api-overview.jd
index d316faf..9fd6f88 100644
--- a/docs/html/preview/api-overview.jd
+++ b/docs/html/preview/api-overview.jd
@@ -69,7 +69,7 @@
 <li>On Android TV devices, apps can put themselves in <a
 href="{@docRoot}preview/features/picture-in-picture.html">picture-in-picture
 mode</a>, allowing them to continue showing content while the user browses or
-interacts with other apps. See below for more information. </li>
+interacts with other apps.</li>
   </ul>
 
 <div class="col-4of10">