Add the word "color"

The 'colr' box specifies color information.

index.bs

@@ -1151,7 +1151,7 @@ The "Version(s)" column in the following table lists the version(s) of the boxes
             <td>[=colr=]</td>
             <td>-</td>
             <td>[[!ISOBMFF]]</td>
-            <td>Used to signal information such as color primaries</td>
+            <td>Used to signal color information such as color primaries</td>
         </tr>
         <tr>
             <td>&nbsp;</td>