Clarify that preview system images can receive ota updates.

Change-Id: Idce5a1049c5221c1a78f6bb2c0f5f7d24bbf94b7
diff --git a/docs/html/preview/index.jd b/docs/html/preview/index.jd
index fddb950..bce5dec 100644
--- a/docs/html/preview/index.jd
+++ b/docs/html/preview/index.jd
@@ -62,7 +62,7 @@
     </a>
     <ul class="dac-actions">
       <li class="dac-action">
-        <a class="dac-action-link" href="{@docRoot}preview/bug">
+        <a class="dac-action-link" href="https://developer.android.com/preview/bug">
           <i class="dac-action-sprite dac-sprite dac-auto-chevron-large"></i>
           Report an issue
         </a>
@@ -87,7 +87,7 @@
   <div class="wrap dac-offset-parent">
 
     <div class="actions">
-      <div><a href="{@docRoot}preview/bug">
+      <div><a href="https://developer.android.com/preview/bug">
         <span class="dac-sprite dac-auto-chevron-large"></span>
         Report an issue
       </a></div>