Add inline ednotes for places that are affected by issue #480.

Author: gkellogg

spec/latest/json-ld-api/index.html

@@ -1612,7 +1612,9 @@ <h3>Algorithm</h3>
                           key-value pairs: (<code>@value</code>-<em>item</em>)
                           and (<code>@language</code>-lowercased
                           <em>language</em>),
-                          <span class="changed">unless <em>item</em> is <code>null</code></span>.</li>
+                          <span class="changed">unless <em>item</em> is <code>null</code></span>.
+                          <span class="ednote">From <a href="#issue-480">Issue 480</a>
+                          the language tag <code>@none</code> represents no language.</span></li>
                       </ol>
                     </li>
                   </ol>
@@ -1653,7 +1655,9 @@ <h3>Algorithm</h3>
                           and <em>item</em> does not have the key
                           <code>@index</code>, add the key-value pair
                           (<code>@index</code>-<em>index</em>) to
-                          <em>item</em>.</li>
+                          <em>item</em>.
+                          <span class="ednote">From <a href="#issue-480">Issue 480</a>
+                          the index <code>@none</code> represents no index.</span></li>
                         <li>Otherwise, if <a>container mapping</a> is <code>@id</code>
                           and <em>item</em> does not have the key
                           <code>@id</code>, add the key-value pair
@@ -1872,7 +1876,9 @@ <h3>Algorithm</h3>
               value to the language code associated with the
               <a>language mapping</a>; unless the
               <a>language mapping</a> is set to <code>null</code> in
-              which case no member is added.</li>
+              which case no member is added. 
+              <span class="ednote">From <a href="#issue-480">Issue 480</a>
+              the language tag <code>@none</code> represents no language.</span></li>
             <li>Otherwise, if the <a>active context</a> has a
               <a>default language</a>, add an <code>@language</code>
               to <em>result</em> and set its value to the
@@ -2135,7 +2141,9 @@ <h3>Algorithm</h3>
               in <a>active context</a> that is <code>@index</code>,
               then the compacted result will be inside of an <code>@index</code>
               container, drop the <code>@index</code> property by continuing
-              to the next <em>expanded property</em>.</li>
+              to the next <em>expanded property</em>.
+              <span class="ednote">From <a href="#issue-480">Issue 480</a>
+              the index <code>@none</code> represents no index.</span></li>
             <li>Otherwise, if <em>expanded property</em> is <code>@index</code>,
               <code>@value</code>, or <code>@language</code>:
               <ol class="algorithm">
@@ -2269,11 +2277,15 @@ <h3>Algorithm</h3>
                       for <em>vocab</em>.</li>
                     <li>Initialize <em>map key</em> to the value associated with
                       with the key that equals <em>container</em> in
-                      <em>expanded item</em>.</li>
+                      <em>expanded item</em>.
+                      <span class="ednote">From <a href="#issue-480">Issue 480</a>
+                      the index <code>@none</code> represents no index.</span></li>
                     <li>If <em>container</em> is <code>@language</code> and
                       <em>compacted item</em> contains the key
                       <code>@value</code>, then set <em>compacted item</em>
-                      to the value associated with its <code>@value</code> key.</li>
+                      to the value associated with its <code>@value</code> key.
+                      <span class="ednote">From <a href="#issue-480">Issue 480</a>
+                      the language tag <code>@none</code> represents no language.</span></li>
                     <li class="changed">If <em>container</em> is <code>@id</code>, set
                       <em>map key</em> to the result of calling the <a
                       href="#iri-compaction">IRI Compaction algorithm</a>