doc: Fix a typo in D-Bus API document

Signed-off-by: Amit Khatri <amit.khatri@samsung.com>
Signed-off-by: Rahul Jain <rahul.jain@samsung.com>

doc/dbus.doxygen

@@ -968,7 +968,7 @@ Interface for performing P2P (Wi-Fi Peer-to-Peer) P2P Device operations.
 	<table>
 	<tr><th>Key</th><th>Value type</th><th>Description</th><th>Required</th></tr>
 	<tr><td>Timeout</td><td>i</td><td>Timeout for operating in seconds</td><td>no</td></tr>
-	<tr><td>RequestedDevicesTypes</td><td>aay</td><td>WPS Device Types to search for</td><td>no</td></tr>
+	<tr><td>RequestedDeviceTypes</td><td>aay</td><td>WPS Device Types to search for</td><td>no</td></tr>
 	<tr><td>DiscoveryType</td><td>s</td><td>"start_with_full" (default, if not specified), "social", "progressive"</td><td>no</td></tr>
 	</table>
       </dd>