Revert of Remove a broken link. (patchset #2 id:20001 of...

Revert of Remove a broken link. (patchset #2 id:20001 of https://codereview.chromium.org/546713003/)

Reason for revert:
I found the link I thought didn't exist.

Original issue's description:
> Remove a broken link.
>
> BUG=none
> R=
> TEST=none
> NOTRY=true
> (documentation only change)
>
> Committed: https://crrev.com/3b9f3449861b9bfc196a152a2c74f6e7cdd18ef1
> Cr-Commit-Position: refs/heads/master@{#294234}

TBR=mkearney@chromium.org,smain@chromium.org,jfb@chromium.org,sbc@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=none

Review URL: https://codereview.chromium.org/560423002

Cr-Commit-Position: refs/heads/master@{#294480}

native_client_sdk/doc_generated/nacl-and-pnacl.html

@@ -14,12 +14,12 @@
 
 </div><h2 id="native-client-nacl">Native Client (NaCl)</h2>
 <p>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&#8217;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.</p>
+applications through the use of advanced <a class="reference external" href="/native-client/community/talks#research">Software Fault Isolation (SFI)
+techniques</a>.  Since its launch in
+2011, Native Client has provided developers with the ability to harness a
+client machine&#8217;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.</p>
 <p>While Native Client provides operating system independence, it requires
 developers to generate architecture-specific executable
 (<strong>nexe</strong>) modules for each hardware platform. This is not only inconvenient

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

@@ -16,12 +16,12 @@ 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.  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