add docs info to Last Oasis and change servername

lgsm/config-default/config-lgsm/loserver/_default.cfg

@@ -13,7 +13,8 @@ steamuser="username"
 steampass='password'
 
 ## Predefined Parameters | https://docs.linuxgsm.com/configuration/start-parameters
-servername="LinuxGSM"
+## https://docs.linuxgsm.com/game-servers/last-oasis
+servername="${selfname}"
 ip="0.0.0.0"
 port="7777"
 queryport="27015"