doc: update 1.9.5 release notes to include net/http/pprof

Change-Id: I7c0716711a2cadd347fdf242c792b109539f7355
Reviewed-on: https://go-review.googlesource.com/103163Reviewed-by: Andrew Bonventre <andybons@golang.org>

doc/devel/release.html

@@ -82,7 +82,8 @@ See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.9.4">Go
 </p>
 
 <p>
-go1.9.5 (released 2018/03/28) includes fixes to the compiler and go command.
+go1.9.5 (released 2018/03/28) includes fixes to the compiler, go command, and
+<code>net/http/pprof</code> package.
 See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.9.5">Go
 1.9.5 milestone</a> on our issue tracker for details.
 </p>