doc/go1.17: fix formatting near httptest

Change-Id: Ic1a0add3a1e137ca5cd0f3e9ce3266191b0b55cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/326777
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

doc/go1.17.html

@@ -763,9 +763,9 @@ <h3 id="minor_library_changes">Minor changes to the library</h3>
 <dl id="net/http/httptest"><dt><a href="/pkg/net/http/httptest/">net/http/httptest</a></dt>
   <dd>
     <p><!-- CL 308950 -->
-      <a href="/pkg/net/http/httptest/#ResponseRecorder.WriteHeader"><code>ResponseRecorder.WriteHeader></code></a>
+      <a href="/pkg/net/http/httptest/#ResponseRecorder.WriteHeader"><code>ResponseRecorder.WriteHeader</code></a>
       now panics when the provided code is not a valid three-digit HTTP status code.
-      This matches the behavior of <a href="/pkg/net/http/#ResponseWriter"><code>ResponseWriter></code></a>
+      This matches the behavior of <a href="/pkg/net/http/#ResponseWriter"><code>ResponseWriter</code></a>
       implementations in the <a href="/pkg/net/http/"><code>net/http</code></a> package.
     </p>
   </dd>