[release-branch.go1.9] doc: document Go 1.8.6

Update golang/go#23515

Change-Id: Id334d8663bf4cbb68f224d1bba4c9ad3855f8aae
Reviewed-on: https://go-review.googlesource.com/89155
Reviewed-by: Andrew Gerrand <adg@golang.org>
(cherry picked from commit 6c27114cedb47e8bd2723416ea0c63d047a2cefc)
Reviewed-on: https://go-review.googlesource.com/89176
Reviewed-by: Andrew Bonventre <andybons@golang.org>

doc/devel/release.html

diff --git a/doc/devel/release.html b/doc/devel/release.html
index c9c2050..24fe583 100644
--- a/doc/devel/release.html
+++ b/doc/devel/release.html
@@ -107,6 +107,13 @@
 1.8.5 milestone</a> on our issue tracker for details.
 </p>
 
+<p>
+go1.8.6 (released 2018/01/22) includes the the same fix in <code>math/big</code>
+as Go 1.9.3 and was released at the same time.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.8.6">Go
+1.8.6 milestone</a> on our issue tracker for details.
+</p>
+
 <h2 id="go1.7">go1.7 (released 2016/08/15)</h2>
 
 <p>