Initial draft of PNaCl bitcode files document.

chrome/common/extensions/docs/templates/json/chrome_sidenav.json

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     "title": "Devtools",
     "items": [
       {
         "title": "Learn Basics",
         "items": [
           {
             "title": "Overview",
             "href": "/devtools/index"
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             "items": [
               {
                 "title": "Glossary",
                 "href": "/native-client/glossary"
               },
               {
                 "title": "Native Client Manifest (nmf) Format",
                 "href": "/native-client/reference/nacl-manifest-format"
               },
               {
+                "title": "PNaCl Bitcode File Reference Manual",
+                "href": "/native-client/dev/reference/pnacl-bitcode-manual"
+              },
+              {
                 "title": "PNaCl Bitcode Reference Manual",
                 "href": "/native-client/reference/pnacl-bitcode-abi"
               },
               {
                 "title": "PNaCl C/C++ Language Support",
                 "href": "/native-client/reference/pnacl-c-cpp-language-support"
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               {
                 "title": "Sandbox Internals",
                 "href": "/native-client/reference/sandbox_internals/index",
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                 "title": "Articles",
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