Small spelling correction.

docs/index.html

@@ -354,7 +354,7 @@
           <tr>
             <td><code>@siteWidth</code></td>
             <td><em>Computed sum of all columns and gutters</em></td>
-            <td>We use some basic match to count the number of columns and gutters and set the width of the <code>.fixed-container()</code> mixin.</td>
+            <td>We use some basic math to count the number of columns and gutters and set the width of the <code>.fixed-container()</code> mixin.</td>
           </tr>
         </tbody>
       </table>