[release-branch.go1.12] doc: add 1.10.8 and 1.11.5 to the releases list

Fixes #30431

Change-Id: I379e78a1c385942a19e1a10b91d732f9a73899e6
Reviewed-on: https://go-review.googlesource.com/c/164041
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit d7518ac51879011a732440d4a49dc7043759e2c8)
Reviewed-on: https://go-review.googlesource.com/c/164077
Reviewed-by: Andrew Bonventre <andybons@golang.org>
diff --git a/doc/devel/release.html b/doc/devel/release.html
index 58f9a58..3b6131b 100644
--- a/doc/devel/release.html
+++ b/doc/devel/release.html
@@ -73,6 +73,13 @@
 1.11.4 milestone</a> on our issue tracker for details.
 </p>
 
+<p>
+go1.11.5 (released 2019/01/23) includes a security fix to the
+<code>crypto/elliptic</code> package.  See
+the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.11.5">Go
+1.11.5 milestone</a> on our issue tracker for details.
+</p>
+
 <h2 id="go1.10">go1.10 (released 2018/02/16)</h2>
 
 <p>
@@ -138,6 +145,13 @@
 Go 1.10.7 milestone</a> on our issue tracker for details.
 </p>
 
+<p>
+go1.10.8 (released 2019/01/23) includes a security fix to the
+<code>crypto/elliptic</code> package.  See
+the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.10.8">Go
+1.10.8 milestone</a> on our issue tracker for details.
+</p>
+
 <h2 id="go1.9">go1.9 (released 2017/08/24)</h2>
 
 <p>