docs: Misc. fixes for M Preview docs.

Change-Id: I816bb18d0110a4a7e585fe727471c2356a93caac
diff --git a/docs/html/preview/api-overview.jd b/docs/html/preview/api-overview.jd
index 5fd6bb8..b8a6033 100644
--- a/docs/html/preview/api-overview.jd
+++ b/docs/html/preview/api-overview.jd
@@ -165,11 +165,11 @@
 
 <p>To see an app implementation of this feature, refer to the
 <a href="https://github.com/googlesamples/android-ConfirmCredentials" class="external-link">
-  Confirm Device Credentials sample</a>.</p>
+  Confirm Credentials sample</a>.</p>
 
 <h2 id="direct-share">Direct Share</h2>
 
-<img src="{@docRoot}preview/images/direct-share-screen_2x.png"
+<img src="{@docRoot}preview/images/direct-share-screen.png"
 srcset="{@docRoot}preview/images/direct-share-screen.png 1x, preview/images/direct-share-screen_2x.png 2x"
 style="float:right; margin:0 0 20px 30px" width="312" height="335" />