doc: document Go 1.9.2

Change-Id: I7d63e747e798d588bdcf2b79b6ecd21fce7bbc9c
Reviewed-on: https://go-review.googlesource.com/73391
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>

doc/devel/release.html

@@ -38,6 +38,17 @@ See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.9.1">Go
 1.9.1 milestone</a> on our issue tracker for details.
 </p>
 
+<p>
+go1.9.2 (released 2017/10/25) includes fixes to the compiler, linker, runtime,
+documentation, <code>go</code> command,
+and the <code>crypto/x509</code>, <code>database/sql</code>, <code>log</code>,
+and <code>net/smtp</code> packages.
+It includes a fix to a bug introduced in Go 1.9.1 that broke <code>go</code> <code>get</code>
+of non-Git repositories under certain conditions.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.9.2">Go
+1.9.2 milestone</a> on our issue tracker for details.
+</p>
+
 <h2 id="go1.8">go1.8 (released 2017/02/16)</h2>
 
 <p>