doc: add go1.1.1 to the release notes

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/10236045

doc/devel/release.html

@@ -21,6 +21,13 @@ Read the <a href="/doc/go1.1.html">Go 1.1 Release Notes</a> for
 more information.
 </p>
 
+<h3 id="go1.1.minor">Minor revisions</h3>
+
+<p>
+go1.1.1 (released 2013/06/13) includes several compiler and runtime bug fixes.
+See the <a href="https://code.google.com/p/go/source/list?name=release-branch.go1.1&r=43c4a41d24382a56a90e924800c681e435d9e399">change history</a> for details.
+</p>
+
 <h2 id="go1">go1 (released 2012/03/28)</h2>
 
 <p>