Add a link to the dex-format doc.

For ease of clicking around when browsing and easier discoverability
in general.

Change-Id: Ia50507df454dd65526e99ef14194c310bb11edb1
diff --git a/docs/dalvik-bytecode.html b/docs/dalvik-bytecode.html
index 2c81e5f..19931d4 100644
--- a/docs/dalvik-bytecode.html
+++ b/docs/dalvik-bytecode.html
@@ -138,6 +138,10 @@
   (listed under "Op & Format") as well as details about the opcode
   syntax.
 </li>
+<li>See the <a href="dex-format.html"><code>.dex</code> file format
+  document</a> for more details about where the bytecode fits into
+  the bigger picture.
+</li>
 </ul>
 
 <h2>Summary of Instruction Set</h2>