docs/library/network: Clarify usage of "bssid" arg in connect() method.

Author: dpgeorge

docs/library/network.rst

@@ -72,8 +72,7 @@ parameter should be `id`.
        connection parameters. For various medium types, there are different
        sets of predefined/recommended parameters, among them:
 
-       * WiFi: *bssid* keyword to connect by BSSID (MAC address) instead
-         of access point name
+       * WiFi: *bssid* keyword to connect to a specific BSSID (MAC address)
 
     .. method:: disconnect()
 
@@ -333,9 +332,12 @@ parameter should be `id`.
         argument is passed. Otherwise, query current state if no argument is
         provided. Most other methods require active interface.
 
-    .. method:: wlan.connect(ssid, password)
+    .. method:: wlan.connect(ssid=None, password=None, \*, bssid=None)
 
         Connect to the specified wireless network, using the specified password.
+        If *bssid* is given then the connection will be restricted to the
+        access-point with that MAC address (the *ssid* must also be specified
+        in this case).
 
     .. method:: wlan.disconnect()