docs: Wi-Fi settings example now uses Settings constant correctly am: 4d215ad4 am: 82293fb0

<p><b>Example intent:</b></p>

<pre>

public void openWifiSettings() {

    Intent intent = new Intent(Intent.ACTION_WIFI_SETTINGS);

    Intent intent = new Intent(Settings.ACTION_WIFI_SETTINGS);

    if (intent.resolveActivity(getPackageManager()) != null) {

        startActivity(intent);

    }