doc: document go1.7.2

Change-Id: I34b3650ee9512879ff7528336813a7850c46ea90
Reviewed-on: https://go-review.googlesource.com/31311Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/devel/release.html

@@ -49,6 +49,14 @@ See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.7.1">Go
 1.7.1 milestone</a> on our issue tracker for details.
 </p>
 
+<p>
+go1.7.2 (released 2016/10/17) includes fixes to the compiler, runtime,
+and the <code>crypto/cipher</code>, <code>crypto/tls</code>,
+<code>net/http</code>, and <code>strings</code> packages.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.7.2">Go
+1.7.2 milestone</a> on our issue tracker for details.
+</p>
+
 <h2 id="go1.6">go1.6 (released 2016/02/17)</h2>
 
 <p>

doc/install-source.html

@@ -203,7 +203,7 @@ To build without <code>cgo</code>, set the environment variable
 Change to the directory that will be its parent
 and make sure the <code>go</code> directory does not exist.
 Then clone the repository and check out the latest release tag
-(<code class="versionTag">go1.7.1</code>, for example):</p>
+(<code class="versionTag">go1.7.2</code>, for example):</p>
 
 <pre>
 $ git clone https://go.googlesource.com/go
@@ -391,7 +391,7 @@ New releases are announced on the
 <a href="//groups.google.com/group/golang-announce">golang-announce</a>
 mailing list.
 Each announcement mentions the latest release tag, for instance,
-<code class="versionTag">go1.7.1</code>.
+<code class="versionTag">go1.7.2</code>.
 </p>
 
 <p>