[NaCl SDK] docs: Remove references to obsolete debugging env vars.

native_client_sdk/src/doc/faq.rst

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 Frequently Asked Questions
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 This document answers some frequently asked questions about Native
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 for an `introduction to GCC`_.
 
 
 Openness, and Supported Architectures and Languages
 ===================================================
 
 Is Native Client open? Is it a standard?
 ----------------------------------------
 
 Native Client is completely open: the executable format is open and the
-`source code is open <nacl_project_>`_. Right
+`source code is open <https://code.google.com/p/nativeclient/>`_. Right
 now the Native Client project is in its early stages, so it's premature
 to consider Native Client for standardization.
 
 We consistenly try to document our design and implementation and hope to
 standardize Portable Native Client when it gains more traction. A good
 example is our :doc:`PNaCl bitcode reference manual
 <reference/pnacl-bitcode-abi>`.
 
 What are the supported instruction set architectures?
 -----------------------------------------------------
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 .. _GHC: http://www.haskell.org/ghc/docs/latest/html/users_guide/code-generators.html
 .. _flang: https://flang-gsoc.blogspot.ie/2013/09/end-of-gsoc-report.html
 .. _native-client-discuss: https://groups.google.com/group/native-client-discuss
 .. _deprecated in Chrome: http://blog.chromium.org/2013/09/saying-goodbye-to-our-old-friend-npapi.html
 .. _OpenGL ES 2.0: https://www.khronos.org/opengles/
 .. _GLES2 file: https://code.google.com/p/chromium/codesearch#chromium/src/ppapi/lib/gl/gles2/gles2.c
 .. _Google Chrome privacy policy: https://www.google.com/chrome/intl/en/privacy.html
 .. _Google Chrome Terms of Service: https://www.google.com/chrome/intl/en/eula_text.html
 .. _naclports: https://code.google.com/p/naclports
 .. _CORS: http://en.wikipedia.org/wiki/Cross-origin_resource_sharing