doc: document release.r60.3

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5267049

doc/devel/release.html

@@ -110,6 +110,11 @@ r60.2
 a memory leak involving maps.
 </p>
 
+<p>
+r60.3 fixes a
+<a href="http://code.google.com/p/go/source/detail?r=01fa62f5e4e5">reflect bug</a>.
+</p>
+
 <h2 id="r59">r59 (released 2011/08/01)</h2>
 
 <p>