doc: Add D-Bus Reattach() method

Commit 0f44ec8eba8a2b01e9c443308a72a2fd3208f7cf ('Add a reattach command
for fast reassociate-back-to-same-BSS') added Reattach(), but forgot to
document it.

Signed-off-by: Jouni Malinen <j@w1.fi>

doc/dbus.doxygen

@@ -282,6 +282,16 @@ fi.w1.wpa_supplicant1.CreateInterface.
 	</dl>
       </li>
 
+      <li>
+	<h3>Reattach ( ) --> nothing</h3>
+	<p>Attempt reassociation back to the current BSS.</p>
+	<h4>Possible errors</h4>
+	<dl>
+	  <dt>fi.w1.wpa_supplicant1.NotConnected</dt>
+	  <dd>Interface is not connected to any network.</dd>
+	</dl>
+      </li>
+
       <li>
 	<h3>AddBlob ( s : name, ay : data ) --> nothing</h3>
 	<p>Adds a blob to the interface.</p>