[release-branch.go1.7] doc: fix typo in the release notes

Change-Id: I003795d8dc2176532ee133740bf35e23a3aa3878
Reviewed-on: https://go-review.googlesource.com/28811Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-on: https://go-review.googlesource.com/28774Reviewed-by: Chris Broadfoot <cbro@golang.org>

doc/devel/release.html

@@ -42,7 +42,7 @@ Read the <a href="/doc/go1.7">Go 1.7 Release Notes</a> for more information.
 <p>
 go1.7.1 (released 2016/09/07) includes fixes to the compiler, runtime,
 documentation, and the <code>compress/flate</code>, <code>hash/crc32</code>,
-<code>io</code> <code>net</code>, <code>net/http</code>,
+<code>io</code>, <code>net</code>, <code>net/http</code>,
 <code>path/filepath</code>, <code>reflect</code>, and <code>syscall</code>
 packages.
 See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.7.1">Go