Updates source.android.com for external contributions to V8

Instructs external contributors that changes to external/v8 should be made
directly at http://code.google.com/p/v8.

Change-Id: I3fe2596a183751eeba968f51d206ea37b1d26bb2
diff --git a/pdk/docs/source/submit-patches.jd b/pdk/docs/source/submit-patches.jd
index fa4cf5f..9e7d9df 100644
--- a/pdk/docs/source/submit-patches.jd
+++ b/pdk/docs/source/submit-patches.jd
@@ -163,4 +163,10 @@
 attention once a proposed fix is added and tests are included. See
 <a href="http://webkit.org/coding/contributing.html">Contributing Code to
 WebKit</a> for details.
+<h3>V8</h3>
+All changes to the V8 project at <code>external/v8</code> should be submitted
+upstream at
+<a href="http://code.google.com/p/v8">http://code.google.com/p/v8</a>. See
+<a href="http://code.google.com/p/v8/wiki/Contributing">Contributing to V8</a>
+for details.
 </div>