doc/go1.11: add missing word

Change-Id: Iad01c9a4a080cf0c317768c34b3fbfd3c9707969
Reviewed-on: https://go-review.googlesource.com/126609Reviewed-by: Andrew Bonventre <andybons@golang.org>

doc/go1.11.html

@@ -645,7 +645,7 @@ for k := range m {
 <dl id="net/http"><dt><a href="/pkg/net/http/">net/http</a></dt>
   <dd>
     <p><!-- CL 71272 -->
-      The <a href="/pkg/net/http/#Transport"><code>Transport</code></a> has a
+      The <a href="/pkg/net/http/#Transport"><code>Transport</code></a> type has a
       new <a href="/pkg/net/http/#Transport.MaxConnsPerHost"><code>MaxConnsPerHost</code></a>
       option that permits limiting the maximum number of connections
       per host.