Revert of Remove 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 8db78c10a0fb2bb743b95278f837dc5db6385d7e..7e9c2942016c9e1ead0066d86f3627d743f265e5 100644
--- a/native_client_sdk/src/doc/nacl-and-pnacl.rst
+++ b/native_client_sdk/src/doc/nacl-and-pnacl.rst
@@ -16,12 +16,12 @@
 ====================
 
 Native Client enables the execution of native code securely inside web
-applications through the use of advanced Software Fault Isolation (SFI)
-techniques.  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 taking advantage of multiple cores with shared
-memory.
+applications through the use of advanced `Software Fault Isolation (SFI)
+techniques </native-client/community/talks#research>`_.  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
+taking advantage of multiple cores with shared memory.
 
 While Native Client provides operating system independence, it requires
 developers to generate architecture-specific executable