Fix documentation (PostgreSQL does support Window Functions, but not MySQL it seems)

h2/src/docsrc/html/features.html

@@ -302,8 +302,8 @@ H2 1.3,
 <td class="compareN">No *15</td>
 <td class="compareN">No *15</td>
 <td class="compareN">No</td>
-<td class="compareY">Yes</td>
 <td class="compareN">No</td>
+<td class="compareY">Yes</td>
 </tr><tr>
 <td>Temporary Tables</td>
 <td class="compareY">Yes</td>