Explain behavior of boundless ripple projection

Change-Id: I27d5c194750313d5d4e0d9dd541f3157b75340ab
diff --git a/docs/html/training/material/animations.jd b/docs/html/training/material/animations.jd
index efc0ee3..86e91a7 100644
--- a/docs/html/training/material/animations.jd
+++ b/docs/html/training/material/animations.jd
@@ -46,9 +46,10 @@
 background as:</p>
 
 <ul>
-<li><code>?android:attr/selectableItemBackground</code> for a bounded ripple</li>
+<li><code>?android:attr/selectableItemBackground</code> for a bounded ripple.</li>
 <li><code>?android:attr/selectableItemBackgroundBorderless</code> for a ripple that extends beyond
-the view</li>
+the view. It will be drawn upon, and bounded by, the nearest parent of the view with a non-null
+background.</li>
 </ul>
 
 <p class="note"><strong>Note:</strong> <code>selectableItemBackgroundBorderless</code> is a new