[NaClDocs] Add note about errno in PNaCl ABI.

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 <li class="toctree-l1"><a class="reference internal" href="/native-client/overview.html">Technical Overview</a><ul class="small-gap">
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+<li class="toctree-l2"><a class="reference internal" href="/native-client/reference/pnacl-bitcode-abi.html#errno-and-errors-in-arithmetic-instructions">Errno and errors in arithmetic instructions</a></li>
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 <li class="toctree-l2"><a class="reference internal" href="/native-client/reference/pnacl-c-cpp-language-support.html#setjmp-and-longjmp"><code>setjmp</code> and <code>longjmp</code></a></li>
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