Fix spelling error in Core App Quality docs.

Bug:
https://code.google.com/p/android/issues/detail?id=213248

Change-Id: Idf83eb4fdc09bc3c78a7786b4bf11707178092c7
(cherry picked from commit 08b10586120f3db6e29e5ece9c3e05462f0c01e9)
diff --git a/docs/html/distribute/essentials/quality/core.jd b/docs/html/distribute/essentials/quality/core.jd
index 4b0b546..0ff44eb 100644
--- a/docs/html/distribute/essentials/quality/core.jd
+++ b/docs/html/distribute/essentials/quality/core.jd
@@ -1041,7 +1041,7 @@
     CR-11
   </td>
   <td>
-    Trigger and observe in the notications drawer all types of notifications
+    Trigger and observe in the notifications drawer all types of notifications
     that the app can display. Expand notifications where applicable (Android
     4.1 and higher), and tap all actions offered.
   </td>