Clarify when input does not have @type when setting "input type" variable. Fixes #215.

Author: gkellogg

index.html

@@ -2458,7 +2458,7 @@ <h3>Algorithm</h3>
         <li>Initialize two empty <a class="changed">maps</a>, <var>result</var>
           <span class="changed">and <var>nests</var>.
             Initialize <var>input type</var> to the last value of the first <a>entry</a> in <var>element</var>
-            expanding to <code>@type</code>, ordering <a>entries</a> lexicographically by key</span>.
+            expanding to <code>@type</code> (if any), ordering <a>entries</a> lexicographically by key</span>.
         </li>
         <li id="alg-expand-each-key-value">
           For each <var>key</var> and <var>value</var> in <var>element</var>,