fix typo

add missing mention of 'invalid' per the previous update

Author: scottaohara

index.html

@@ -1957,7 +1957,7 @@ <h3>HTML Element Role Mappings</h3>
               <td class="atk"><div class="general">Use WAI-ARIA mapping</div></td>
               <td class="ax"><div class="general">Use WAI-ARIA mapping</div></td>
               <!-- <td class="naming"></td> -->
-              <td class="comments">An `input` with a missing <a data-cite="html/input.html#attr-input-type">`type` attribute</a> 
+              <td class="comments">An `input` with a missing or invalid <a data-cite="html/input.html#attr-input-type">`type` attribute</a> 
                 defaults to the Text state.</td>
             </tr>
             <tr tabindex="-1" id="el-input-textetc-autocomplete">