docs: update calendar, add news item and link release notes for 17.1.5

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>

docs/index.html

@@ -16,6 +16,12 @@
 
 <h1>News</h1>
 
+<h2>August 7, 2017</h2>
+<p>
+<a href="relnotes/17.1.6.html">Mesa 17.1.6</a> is released.
+This is a bug-fix release.
+</p>
+
 <h2>July 14, 2017</h2>
 <p>
 <a href="relnotes/17.1.5.html">Mesa 17.1.5</a> is released.

docs/release-calendar.html

@@ -38,14 +38,7 @@ if you'd like to nominate a patch in the next stable release.
 <th>Release manager</th>
 <th>Notes</th>
 </tr>
-<tr>
-<td rowspan="3">17.1</td>
-<td>2017-07-28</td>
-<td>17.1.6</td>
-<td>Emil Velikov</td>
-<td></td>
-</tr>
-<tr>
+<td rowspan="2">17.1</td>
 <td>2017-08-11</td>
 <td>17.1.7</td>
 <td>Juan A. Suarez Romero</td>

docs/relnotes.html

@@ -21,6 +21,7 @@ The release notes summarize what's new or changed in each Mesa release.
 </p>
 
 <ul>
+<li><a href="relnotes/17.1.6.html">17.1.6 release notes</a>
 <li><a href="relnotes/17.1.5.html">17.1.5 release notes</a>
 <li><a href="relnotes/17.1.4.html">17.1.4 release notes</a>
 <li><a href="relnotes/17.1.3.html">17.1.3 release notes</a>