doc: document Go 1.11.2

Change-Id: Iaff03911f1807d462f1966590626bd486807f53d
Reviewed-on: https://go-review.googlesource.com/c/147178Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/devel/release.html

@@ -41,6 +41,14 @@ See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.11.1">Go
 1.11.1 milestone</a> on our issue tracker for details.
 </p>
 
+<p>
+go1.11.2 (released 2018/11/02) includes fixes to the compiler, linker,
+documentation, go command, and the <code>database/sql</code> and
+<code>go/types</code> packages.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.11.2">Go
+1.11.2 milestone</a> on our issue tracker for details.
+</p>
+
 <h2 id="go1.10">go1.10 (released 2018/02/16)</h2>
 
 <p>