Update vmSafeMode documentation

Bug: 2267583
Bug: 2553512
Bug: 12457423
Bug: 19664166
Change-Id: I6036c041176ead60deb745e1c4d27fe4addd47bd
diff --git a/docs/html/guide/topics/manifest/application-element.jd b/docs/html/guide/topics/manifest/application-element.jd
index 8a0e837..b5af9c3 100644
--- a/docs/html/guide/topics/manifest/application-element.jd
+++ b/docs/html/guide/topics/manifest/application-element.jd
@@ -449,11 +449,15 @@
 <dt><a name="vmSafeMode"></a>{@code android:vmSafeMode}</dt>
 <dd>Indicates whether the app would like the virtual machine (VM) to operate
 in safe mode. The default value is {@code "false"}.
+
+<p> This attribute was added in API level 8 where a value of "true"
+disabled the Dalvik just-in-time (JIT) compiler. </p>
+
+<p> This attribute was adapted in API level 22 where a value of "true"
+disabled the ART ahead-of-time (AOT) compiler. </p>
 </dd>
 
 
-
-
 </dl></dd>
 
 <!-- ##api level indication## -->