doc/go1: minor fixes

        Fixes #3427.
        Part of issue 3424.

R=golang-dev, bradfitz, r
CC=golang-dev
https://golang.org/cl/5959045

doc/go1.html

@@ -1253,7 +1253,7 @@ Since the package's functionality is new, no updating is necessary.
 <p>
 In Go 1 the <a href="/pkg/net/http/"><code>http</code></a> package is refactored,
 putting some of the utilities into a
-<a href="/pkg/net/httputil/"><code>httputil</code></a> subdirectory.
+<a href="/pkg/net/http/httputil/"><code>httputil</code></a> subdirectory.
 These pieces are only rarely needed by HTTP clients.
 The affected items are:
 </p>
@@ -1261,7 +1261,6 @@ The affected items are:
 <ul>
 <li>ClientConn</li>
 <li>DumpRequest</li>
-<li>DumpRequest</li>
 <li>DumpRequestOut</li>
 <li>DumpResponse</li>
 <li>NewChunkedReader</li>