[NaCl SDK]: Docs -- fix typo in nacl manifest specification (missing "portable")

The manifest spec doc was missing the extra dictionary for "portable".
Spotted by Brad. Thanks!

BUG=none
NOTRY=true
R=sbc@chromium.org

Review URL: https://codereview.chromium.org/394283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283576 0039d316-1c4b-4281-b951-d872f2087c98

native_client_sdk/doc_generated/reference/nacl-manifest-format.html

@@ -61,6 +61,8 @@ section for the rules on URL resolution.</p>
 <pre class="prettyprint">
 {
   &quot;program&quot;: {
+    &quot;portable&quot;: {
+      // Required
       &quot;pnacl-translate&quot;: {
         // url is required
         &quot;url&quot;: &quot;url_to_my_pexe&quot;,
@@ -77,6 +79,7 @@ section for the rules on URL resolution.</p>
         &quot;optlevel&quot;: 0
       }
     }
+  }
 }
 </pre>
 <p>Portable Native Client applications can also specify an <code>optlevel</code> field.

native_client_sdk/src/doc/reference/nacl-manifest-format.rst

@@ -56,6 +56,8 @@ Example of a ``program`` for Portable Native Client:
 
   {
     "program": {
+      "portable": {
+        // Required
         "pnacl-translate": {
           // url is required
           "url": "url_to_my_pexe",
@@ -73,6 +75,7 @@ Example of a ``program`` for Portable Native Client:
         }
       }
     }
+  }
 
 Portable Native Client applications can also specify an ``optlevel`` field.
 The ``optlevel`` field is an optimization level *hint*, which is a number