Fix broken links on NaCl pages of developer.chrome.com.

native_client_sdk/src/doc/reference/pnacl-c-cpp-language-support.rst

 ============================
 PNaCl C/C++ Language Support
 ============================
 
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    :depth: 3
 
 Source language support
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 .. _memory_model_and_atomics:
 
 Memory Model and Atomics
 ========================
 
 Memory Model for Concurrent Operations
 --------------------------------------
 
 The memory model offered by PNaCl relies on the same coding guidelines
 as the C11/C++11 one: concurrent accesses must always occur through
-atomic primitives (offered by `atomic intrinsics
-<PNaClLangRef.html#atomicintrinsics>`_), and these accesses must always
+atomic primitives (offered by :ref:`atomic intrinsics 
+<bitcode_atomicintrinsics>`), and these accesses must always
 occur with the same size for the same memory location. Visibility of
 stores is provided on a happens-before basis that relates memory
 locations to each other as the C11/C++11 standards do.
 
 Non-atomic memory accesses may be reordered, separated, elided or fused
 according to C and C++'s memory model before the pexe is created as well
 as after its creation. Accessing atomic memory location through
 non-atomic primitives is :ref:`Undefined Behavior <undefined_behavior>`.
 
 As in C11/C++11 some atomic accesses may be implemented with locks on
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   A similar feature is **thread suspension**: The ability to
   asynchronously suspend and resume a thread and inspect or modify its
   execution state (such as register state).
 
   Neither PNaCl nor NaCl currently support asynchronous interruption
   or suspension of threads.
 
 If PNaCl were to support either of these, the interaction of
 ``volatile`` and atomics with same-thread signal handling would need
 to be carefully detailed.