PNaCl documentation: add SIMD vectors.

native_client_sdk/src/doc/faq.rst

Index: native_client_sdk/src/doc/faq.rst
diff --git a/native_client_sdk/src/doc/faq.rst b/native_client_sdk/src/doc/faq.rst
index c27a7117574b334bf45f39c8e20e9838948d10a9..37b84fe4be294a2da11993944009321027e30ca9 100644
--- a/native_client_sdk/src/doc/faq.rst
+++ b/native_client_sdk/src/doc/faq.rst
@@ -65,7 +65,7 @@ Portable Native client further enhances the above:
 .. causes of slowness? How can code be made faster? What's the best way
 .. to use Pepper's asynchronous APIs? What do I need to know about
 .. threads and inter-thread communications? Can I use SIMD or other
-.. processor-specific instructions? What aboutt he GPU?
+.. processor-specific instructions? What about the GPU?
 
 For more details, refer to the :doc:`history behind and comparison of
 NaCl and PNaCl <nacl-and-pnacl>`.
@@ -113,6 +113,10 @@ cases are likely to achieve better or worse performance than the above
 averages. For example floating-point heavy code usually exhibits much
 lower overheads whereas very branch-heavy code often performs worse.
 
+Note that PNaCl supports performance features that are often used in
+native code such as :ref:`threading <language_support_threading>` and
+:ref:`Portable SIMD Vectors <portable_simd_vectors>`.
+
 For details, see:
 
 * `Adapting Software Fault Isolation to Contemporary CPU Architectures
@@ -271,7 +275,8 @@ Does Native Client support SIMD vector instructions?
 Native Client currently supports SSE on x86 and NEON on ARM. Support for
 AVX on x86 is under way.
 
-Portable Native Client should support SIMD vectors in the near future.
+Portable Native Client supports portable SIMD vectors, as detailed in
+:ref:`Portable SIMD Vectors <portable_simd_vectors>`.
 
 Can I use Native Client for 3D graphics?
 ----------------------------------------