Fix a broken link.

native_client_sdk/src/doc/nacl-and-pnacl.rst

Index: native_client_sdk/src/doc/nacl-and-pnacl.rst
diff --git a/native_client_sdk/src/doc/nacl-and-pnacl.rst b/native_client_sdk/src/doc/nacl-and-pnacl.rst
index 7e9c2942016c9e1ead0066d86f3627d743f265e5..7eb07fb46a4f3e5ee6699e8bcb142462177935b6 100644
--- a/native_client_sdk/src/doc/nacl-and-pnacl.rst
+++ b/native_client_sdk/src/doc/nacl-and-pnacl.rst
@@ -17,7 +17,7 @@ Native Client (NaCl)
 
 Native Client enables the execution of native code securely inside web
 applications through the use of advanced `Software Fault Isolation (SFI)
-techniques </native-client/community/talks#research>`_.  Since its launch in
+techniques <http://research.google.com/pubs/pub35649.html>`_.  Since its launch in
 2011, Native Client has provided developers with the ability to harness a
 client machine's computational power to a much fuller extent than traditional
 web technologies, by running compiled C and C++ code at near-native speeds and