openconnect: update README

Signed-off-by: Gottfried Haider <gottfried.haider@gmail.com>

net/openconnect/README

@@ -13,6 +13,7 @@ config interface 'MYVPN'
         option serverhash 'AE7FF6A0426F0A0CD0A02EB9EC3C5066FAEB0B25'
         option token_mode 'rsa' # when built with stoken support
         option token_secret 'secret' # when built with stoken support
+        option authgroup 'DEFAULT'
 
 The additional files are also used:
 /etc/openconnect/user-cert-vpn-MYVPN.pem: The user certificate
@@ -28,4 +29,4 @@ the MYVPN interface and lan.
 
 
 There is a luci plugin to allow configuring an openconnect interface from
-the web environment; see the luci-protocol-openconnect package.
+the web environment; see the luci-proto-openconnect package.