docs: add an additional final cycle for 17.1

Cc: Emil Velikov <emil.velikov@collabora.com>
Cc: Juan A. Suarez Romero <jasuarez@igalia.com>
Signed-off-by: Andres Gomez <agomez@igalia.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Juan A. Suarez Romero <jasuarez@igalia.com>
diff --git a/docs/release-calendar.html b/docs/release-calendar.html
index 8b30b34..3c48e9a 100644
--- a/docs/release-calendar.html
+++ b/docs/release-calendar.html
@@ -39,10 +39,16 @@
 <th>Notes</th>
 </tr>
 <tr>
-<td>17.1</td>
+<td rowspan="2">17.1</td>
 <td>2017-08-25</td>
 <td>17.1.8</td>
 <td>Andres Gomez</td>
+<td></td>
+</tr>
+<tr>
+<td>2017-09-08</td>
+<td>17.1.9</td>
+<td>Andres Gomez</td>
 <td>Final planned release for the 17.1 series</td>
 </tr>
 <tr>