doc: document r57.2

R=adg, r
CC=golang-dev
https://golang.org/cl/4627042

doc/devel/release.html

@@ -162,6 +162,7 @@ For other uses, see the <a href="/pkg/runtime/pprof/">runtime/pprof</a> document
 <h3 id="r57.minor">Minor revisions</h3>
 
 <p>r57.1 fixes a <a href="http://code.google.com/p/go/source/detail?r=ff2bc62726e7145eb2ecc1e0f076998e4a8f86f0">nil pointer dereference in http.FormFile</a>.</p>
+<p>r57.2 fixes a <a href="http://code.google.com/p/go/source/detail?r=063b0ff67d8277df03c956208abc068076818dae">use of uninitialized memory in programs that misuse <code>goto</code></a>.</p>
 
 <h2 id="r56">r56 (released 2011/03/16)</h2>