Clarification: list additional aria attributes for file and color inputs (#464)

closes #457

`input type=file` can allow for the aria-required, invalid and disabled attributes.  These attributes are already supported by checkers.

Additionally, `input type=color` also allows for the `aria-disabled` attribute.  Note HTML does not allow the required attribute for this element, so aria-required and invalid wouldn't be applicable here.

Author: scottaohara

index.html

@@ -1675,7 +1675,7 @@ <h2 id="docconformance">
                 <a><strong class="nosupport">No `role`</strong></a>
               </p>
               <p>
-                <a data-cite="wai-aria-1.2#global_states">Global `aria-*` attributes</a>.
+                <a data-cite="wai-aria-1.2#global_states">Global `aria-*` attributes</a> and `aria-disabled` attribute.
               </p>
             </td>
           </tr>
@@ -1743,7 +1743,8 @@ <h2 id="docconformance">
                 <a><strong class="nosupport">No `role`</strong></a>
               </p>
               <p>
-                <a data-cite="wai-aria-1.2#global_states">Global `aria-*` attributes</a>.
+                <a data-cite="wai-aria-1.2#global_states">Global `aria-*` attributes</a>, 
+                `aria-disabled`, `aria-invalid` and `aria-required` attributes.
               </p>
             </td>
           </tr>