Merge pull request #66 from boreq/utf-is-not-unicode

Change wording from UTF-16 to Unicode

index.html

@@ -859,7 +859,7 @@ <h3 id="message-format">Message format</h3>
             </tr>
             <tr>
                 <td>content</td>
-                <td>If the message is not encrypted, This is a dictionary containing free-form data for applications to interpret, plus a mandatory <em>type</em> field. The <em>type</em> field allows applications to filter out message types they don’t understand and must be a UTF-16 string between 3 and 52 code units long (inclusive). If the message is encrypted, then this is a base64 encoded string, followed by a suffix of <code>.box</code>; we will describe private messages later in this document.</td>
+                <td>If the message is not encrypted, This is a dictionary containing free-form data for applications to interpret, plus a mandatory <em>type</em> field. The <em>type</em> field allows applications to filter out message types they don’t understand and must be a Unicode string between 3 and 52 code units long (inclusive). If the message is encrypted, then this is a base64 encoded string, followed by a suffix of <code>.box</code>; we will describe private messages later in this document.</td>
             </tr>
         </table>
         <aside style="align-self: start; position: relative; top: 19px;">