docs: rephrase 9.2.1, 9.1.7 news item

Both are bug-fix releases, not new development releases.
diff --git a/docs/index.html b/docs/index.html
index 990b929..3b9c436 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -18,15 +18,9 @@
 
 <h2>October 4, 2013</h2>
 <p>
-<a href="relnotes/9.2.1.html">Mesa 9.2.1</a> is released.
-This is a new development release.
-See the release notes for more information about the release.
-</p>
-
-<p>
-<a href="relnotes/9.1.7.html">Mesa 9.1.7</a> is released.
-This is a new development release.
-See the release notes for more information about the release.
+<a href="relnotes/9.2.1.html">Mesa 9.2.1</a> and
+<a href="relnotes/9.1.7.html">Mesa 9.1.7</a> are released,
+both bug-fix releases.
 </p>
 
 <h2>August 27, 2013</h2>