dbus: Document more possible BSS/RSA/KeyMgmt values

This is probably not ideal, since it would be better if it ended up
being autogenerated somehow, but at least it's somewhat of an
improvement.

Also added a comment that encourages keeping the docs in sync.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

doc/dbus.doxygen

@@ -2028,7 +2028,7 @@ scan results.
 	<h3>RSN - a{sv} - (read)</h3>
 	<p>RSN information of the BSS. Empty dictionary indicates no RSN support. Dictionary entries are:</p>
 	<table>
-	  <tr><td>KeyMgmt</td><td>as</td><td>Key management suite. Possible array elements: "wpa-psk", "wpa-eap", "wpa-ft-psk", "wpa-ft-eap", "wpa-psk-sha256", "wpa-eap-sha256",</td>
+	  <tr><td>KeyMgmt</td><td>as</td><td>Key management suite. Possible array elements: "wpa-psk", "wpa-ft-psk", "wpa-psk-sha256", "wpa-eap", "wpa-ft-eap", "wpa-eap-sha256", "wpa-eap-suite-b", "wpa-eap-suite-b-192", "wpa-fils-sha256", "wpa-fils-sha384", "wpa-ft-fils-sha256", "wpa-ft-fils-sha384", "sae", "ft-sae", "wpa-none"</td>
 	  <tr><td>Pairwise</td><td>as</td><td>Pairwise cipher suites. Possible array elements: "ccmp", "tkip"</td>
 	  <tr><td>Group</td><td>s</td><td>Group cipher suite. Possible values are: "ccmp", "tkip", "wep104", "wep40"</td>
 	  <tr><td>MgmtGroup</td><td>s</td><td>Mangement frames cipher suite. Possible values are: "aes128cmac"</td>

wpa_supplicant/dbus/dbus_new_handlers.c

@@ -4507,7 +4507,12 @@ static dbus_bool_t wpas_dbus_get_bss_security_prop(
 	if (!wpa_dbus_dict_open_write(&variant_iter, &iter_dict))
 		goto nomem;
 
-	/* KeyMgmt */
+	/*
+	 * KeyMgmt
+	 *
+	 * When adding a new entry here, please take care to extend key_mgmt[]
+	 * and keep documentation in doc/dbus.doxygen up to date.
+	 */
 	n = 0;
 	if (ie_data->key_mgmt & WPA_KEY_MGMT_PSK)
 		key_mgmt[n++] = "wpa-psk";